ARM: 8007/1: Remove extraneous kcmp syscall ignore

The kcmp system call was ported to ARM in
commit 3f7d1fe1
"ARM: 7665/1: Wire up kcmp syscall".

Fixes: 3f7d1fe1 ("ARM: 7665/1: Wire up kcmp syscall")
Signed-off-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>