Rename arch/arm/mach-omap2/memory.c to arch/arm/mach-omap2/sdrc2xxx.c, since
it contains exclusively SDRAM-related functions.  Most of the functions
are also OMAP2xxx-specific - those which are common will be separated out
in a following patch.

linux-omap source commit is fe212f797e2efef9dc88bcb5db7cf9db3f9f562e.
Signed-off-by: NPaul Walmsley <paul@pwsan.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>