[ARM] Fix SA110/SA1100 cache flushing

We had two implementations for flushing the cache, which meant StrongARM
caches weren't being correctly flushed.  Fix this by always using the
v4wb_flush_kern_cache_all method, rather than duplicating it.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --cc arch/arm/mm/cache-v4wb.S
Simple merge

diff --cc arch/arm/mm/proc-sa110.S
Simple merge

diff --cc arch/arm/mm/proc-sa1100.S
Simple merge