treewide: disable spectre mitigation on unaffected Arm64 targets

Cortex-A53 is not vulnerable to any Spectre variants.

Ref: https://developer.arm.com/Arm%20Security%20Center/Speculative%20Processor%20Vulnerability
Signed-off-by: Qingfang Deng <[email protected]>

target/linux/bcm27xx/bcm2710/config-6.1

@@ -303,6 +303,7 @@ CONFIG_MFD_CORE=y
 CONFIG_MFD_SYSCON=y
 CONFIG_MICROCHIP_PHY=y
 CONFIG_MIGRATION=y
+# CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not set
 CONFIG_MMC=y
 # CONFIG_MMC_BCM2835 is not set
 CONFIG_MMC_BCM2835_DMA=y

target/linux/bcm4908/config-5.15

@@ -135,6 +135,7 @@ CONFIG_MDIO_DEVRES=y
 CONFIG_MEMFD_CREATE=y
 CONFIG_MFD_SYSCON=y
 CONFIG_MIGRATION=y
+# CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not set
 CONFIG_MODULES_USE_ELF_RELA=y
 CONFIG_MTD_BRCM_U_BOOT=y
 CONFIG_MTD_CMDLINE_PARTS=y

target/linux/bcm4908/config-6.1

@@ -136,6 +136,7 @@ CONFIG_MDIO_DEVRES=y
 CONFIG_MEMFD_CREATE=y
 CONFIG_MFD_SYSCON=y
 CONFIG_MIGRATION=y
+# CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not set
 CONFIG_MODULES_USE_ELF_RELA=y
 CONFIG_MTD_BRCM_U_BOOT=y
 CONFIG_MTD_CMDLINE_PARTS=y

target/linux/mediatek/filogic/config-6.1

@@ -232,6 +232,7 @@ CONFIG_MEMFD_CREATE=y
 CONFIG_MESSAGE_LOGLEVEL_DEFAULT=7
 CONFIG_MFD_SYSCON=y
 CONFIG_MIGRATION=y
+# CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not set
 CONFIG_MMC=y
 CONFIG_MMC_BLOCK=y
 CONFIG_MMC_CQHCI=y

target/linux/mediatek/filogic/config-6.6

@@ -245,6 +245,7 @@ CONFIG_MEDIATEK_WATCHDOG=y
 CONFIG_MESSAGE_LOGLEVEL_DEFAULT=7
 CONFIG_MFD_SYSCON=y
 CONFIG_MIGRATION=y
+# CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not set
 CONFIG_MMC=y
 CONFIG_MMC_BLOCK=y
 CONFIG_MMC_CQHCI=y

target/linux/mediatek/mt7622/config-6.1

@@ -234,6 +234,7 @@ CONFIG_MEMFD_CREATE=y
 CONFIG_MESSAGE_LOGLEVEL_DEFAULT=7
 CONFIG_MFD_SYSCON=y
 CONFIG_MIGRATION=y
+# CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not set
 CONFIG_MMC=y
 CONFIG_MMC_BLOCK=y
 CONFIG_MMC_CQHCI=y

target/linux/mediatek/mt7622/config-6.6

@@ -248,6 +248,7 @@ CONFIG_MEDIATEK_WATCHDOG=y
 CONFIG_MESSAGE_LOGLEVEL_DEFAULT=7
 CONFIG_MFD_SYSCON=y
 CONFIG_MIGRATION=y
+# CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not set
 CONFIG_MMC=y
 CONFIG_MMC_BLOCK=y
 CONFIG_MMC_CQHCI=y

target/linux/mvebu/cortexa53/config-6.1

@@ -52,6 +52,7 @@ CONFIG_ILLEGAL_POINTER_VALUE=0xdead000000000000
 CONFIG_MAILBOX=y
 # CONFIG_MAILBOX_TEST is not set
 CONFIG_MFD_SYSCON=y
+# CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not set
 CONFIG_MMC_SDHCI_XENON=y
 CONFIG_MODULES_USE_ELF_RELA=y
 CONFIG_MVEBU_GICP=y

target/linux/qualcommax/config-6.1

@@ -227,6 +227,7 @@ CONFIG_MEMFD_CREATE=y
 # CONFIG_MFD_QCOM_RPM is not set
 CONFIG_MFD_SYSCON=y
 CONFIG_MIGRATION=y
+# CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not set
 CONFIG_MMC=y
 CONFIG_MMC_BLOCK=y
 CONFIG_MMC_BLOCK_MINORS=32

target/linux/qualcommax/config-6.6

@@ -230,6 +230,7 @@ CONFIG_MDIO_IPQ4019=y
 # CONFIG_MFD_QCOM_RPM is not set
 CONFIG_MFD_SYSCON=y
 CONFIG_MIGRATION=y
+# CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not set
 CONFIG_MMC=y
 CONFIG_MMC_BLOCK=y
 CONFIG_MMC_BLOCK_MINORS=32

target/linux/sunxi/cortexa53/config-6.1

@@ -52,6 +52,7 @@ CONFIG_GENERIC_MSI_IRQ_DOMAIN=y
 CONFIG_ILLEGAL_POINTER_VALUE=0xdead000000000000
 CONFIG_MDIO_BUS_MUX=y
 CONFIG_MICREL_PHY=y
+# CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY is not set
 CONFIG_MODULES_USE_ELF_RELA=y
 CONFIG_MUSB_PIO_ONLY=y
 CONFIG_NEED_SG_DMA_LENGTH=y