kernel: add missing symbol to 5.10 config

Kernel 5.10.158 added a prompt for the FUNCTION_ERROR_INJECTION symbol.
This is exposed in builds with CONFIG_KERNEL_KPROBES enabled, causing
those builds to fail due to a missing symbol. Add the symbol to fix
this.

Fixes: 6801c460b6a7 ("kernel: bump 5.10 to 5.10.158")
Signed-off-by: Stijn Tintel <[email protected]>

target/linux/generic/config-5.10

@@ -2027,6 +2027,7 @@ CONFIG_FSNOTIFY=y
 # CONFIG_FUJITSU_ES is not set
 # CONFIG_FUJITSU_LAPTOP is not set
 # CONFIG_FUJITSU_TABLET is not set
+# CONFIG_FUNCTION_ERROR_INJECTION is not set
 # CONFIG_FUNCTION_TRACER is not set
 # CONFIG_FUSE_FS is not set
 # CONFIG_FUSION is not set