x86: generic: config-6.6: refresh config

Add CONFIG_ARCH_CONFIGURES_CPU_MITIGATIONS=y which was introduced
back in April of this year[1]

1. https://github.com/torvalds/linux/commit/ce0abef6a1d540acef85068e0e82bdf1fbeeb0e9

Signed-off-by: John Audia <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16535
Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/x86/config-6.6

@@ -9,6 +9,7 @@
 CONFIG_AMD_NB=y
 CONFIG_ARCH_32BIT_OFF_T=y
 CONFIG_ARCH_CLOCKSOURCE_INIT=y
+CONFIG_ARCH_CONFIGURES_CPU_MITIGATIONS=y
 CONFIG_ARCH_CORRECT_STACKTRACE_ON_KRETPROBE=y
 CONFIG_ARCH_HIBERNATION_POSSIBLE=y
 CONFIG_ARCH_MAY_HAVE_PC_FDC=y