ARM: 7460/1: remove asm/locks.h

Commit 64ac24e7 ("Generic semaphore
implementation") removed the last include of this header. Apparently it
was just an oversight to keep this header. It can safely be removed now.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>