mediatek: enable configfs for DT overlay on mt7622 and mt7623

Enable kernel options to allow loading device tree overlay via configfs
at runtime. This is useful for devboards like the BPi-R2 and BPi-R64
which got RasbPi-compatible 40-pin GPIO header which allow all sorts
of extensions.

Signed-off-by: Daniel Golle <[email protected]>

target/linux/mediatek/mt7622/config-5.10

@@ -90,6 +90,7 @@ CONFIG_COMPAT_32BIT_TIME=y
 CONFIG_COMPAT_BINFMT_ELF=y
 CONFIG_COMPAT_NETLINK_MESSAGES=y
 CONFIG_COMPAT_OLD_SIGACTION=y
+CONFIG_CONFIGFS_FS=y
 CONFIG_CONSOLE_LOGLEVEL_DEFAULT=15
 # CONFIG_CPUFREQ_DT is not set
 CONFIG_CPU_FREQ=y
@@ -291,6 +292,7 @@ CONFIG_NVMEM=y
 CONFIG_NVMEM_SYSFS=y
 CONFIG_OF=y
 CONFIG_OF_ADDRESS=y
+CONFIG_OF_CONFIGFS=y
 CONFIG_OF_EARLY_FLATTREE=y
 CONFIG_OF_FLATTREE=y
 CONFIG_OF_GPIO=y
@@ -298,6 +300,7 @@ CONFIG_OF_IRQ=y
 CONFIG_OF_KOBJ=y
 CONFIG_OF_MDIO=y
 CONFIG_OF_NET=y
+CONFIG_OF_OVERLAY=y
 CONFIG_OLD_SIGSUSPEND3=y
 CONFIG_PADATA=y
 CONFIG_PARTITION_PERCPU=y

target/linux/mediatek/mt7623/config-5.10

@@ -446,6 +446,7 @@ CONFIG_NVMEM=y
 CONFIG_NVMEM_SYSFS=y
 CONFIG_OF=y
 CONFIG_OF_ADDRESS=y
+CONFIG_OF_CONFIGFS=y
 CONFIG_OF_EARLY_FLATTREE=y
 CONFIG_OF_FLATTREE=y
 CONFIG_OF_GPIO=y
@@ -454,6 +455,7 @@ CONFIG_OF_IRQ=y
 CONFIG_OF_KOBJ=y
 CONFIG_OF_MDIO=y
 CONFIG_OF_NET=y
+CONFIG_OF_OVERLAY=y
 CONFIG_OLD_SIGACTION=y
 CONFIG_OLD_SIGSUSPEND3=y
 CONFIG_PADATA=y