ARM: 8954/1: NOMMU: remove stubs for swapops

Stubs for swapops are not required after 9b98fa22

 (mm: stub out
all of swapops.h for !CONFIG_MMU)

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>