ARM: 6105/1: Fix the __arm_ioremap_caller() definition in nommu.c

Commit 31aa8fd6 introduced the __arm_ioremap_caller() function but the
nommu.c version did not have the _caller suffix.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>