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: 6801c460b6 ("kernel: bump 5.10 to 5.10.158")
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>