omap3: rx51: Add SDRAM init

This patch adds board specific SDRAM init for RX51. This patch is a
collaboration of work from following people:

Juha Yrjola: Original code
Lauri Leukkunen: Port to RX51
Tero Kristo: Support for multiple OPP:s, merge of patches
Samu Onkalo: Fixed SDRAM parameters according to specs
Kalle Jokiniemi: A fix for rounding error

Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
Cc: Samu Onkalo <samu.p.onkalo@nokia.com>
Cc: Kalle Jokiniemi <kalle.jokiniemi@digia.com>
Cc: Lauri Leukkunen <lauri.leukkunen@nokia.com>
Cc: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index f40619e..d56fb2b 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -72,6 +72,7 @@
 					   mmc-twl4030.o
 obj-$(CONFIG_MACH_NOKIA_N8X0)		+= board-n8x0.o
 obj-$(CONFIG_MACH_NOKIA_RX51)		+= board-rx51.o \
+					   board-rx51-sdram.o \
 					   board-rx51-peripherals.o \
 					   mmc-twl4030.o
 obj-$(CONFIG_MACH_OMAP_ZOOM2)		+= board-zoom2.o \