kernel: add missing symbol to 4.19 config

Kernel 4.19.47 added a new kernel config symbol ARM64_ERRATUM_1463225.
This causes a build failure for sunxi/cortexa53. Add the symbol to the
generic config to fix this, and avoid future build failures on other
arm64 targets that expose this symbol. As the erratum only affects
Cortex-A76 cores, we can safely disable it.

Signed-off-by: Stijn Tintel <[email protected]>

target/linux/generic/config-4.19

@@ -285,6 +285,7 @@ CONFIG_ARCH_MMAP_RND_COMPAT_BITS_MIN=8
 # CONFIG_ARC_EMAC is not set
 # CONFIG_ARC_IRQ_NO_AUTOSAVE is not set
 # CONFIG_ARM64_ERRATUM_1024718 is not set
+# CONFIG_ARM64_ERRATUM_1463225 is not set
 # CONFIG_ARM64_ERRATUM_819472 is not set
 # CONFIG_ARM64_ERRATUM_824069 is not set
 # CONFIG_ARM64_ERRATUM_826319 is not set