[ARM] Fix sa11x0 SDRAM selection

Avoid folk having to edit cpu-sa1110.c to select their RAM type;
instead, allow the SDRAM type to be selected via the kernel
command line.

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

diff --cc arch/arm/mach-sa1100/cpu-sa1110.c
Simple merge