SPL: Add DMA library

Adding a DMA library to the SPL. It is used if CONFIG_SPL_DMA_SUPPORT is
defined.

Signed-off-by: Simon Schwarz <simonschwarzcor@gmail.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

doc/README.SPL

@@ -62,3 +62,4 @@ CONFIG_SPL_FAT_SUPPORT (fs/fat/libfat.o)
 CONFIG_SPL_LIBGENERIC_SUPPORT (lib/libgeneric.o)
 CONFIG_SPL_POWER_SUPPORT (drivers/power/libpower.o)
 CONFIG_SPL_NAND_SUPPORT (drivers/mtd/nand/libnand.o)
+CONFIG_SPL_DMA_SUPPORT (drivers/dma/libdma.o)

spl/Makefile

@@ -54,6 +54,7 @@ LIBS-$(CONFIG_SPL_FAT_SUPPORT) += fs/fat/libfat.o
 LIBS-$(CONFIG_SPL_LIBGENERIC_SUPPORT) += lib/libgeneric.o
 LIBS-$(CONFIG_SPL_POWER_SUPPORT) += drivers/power/libpower.o
 LIBS-$(CONFIG_SPL_NAND_SUPPORT) += drivers/mtd/nand/libnand.o
+LIBS-$(CONFIG_SPL_DMA_SUPPORT) += drivers/dma/libdma.o
 
 ifeq ($(SOC),omap3)
 LIBS-y += $(CPUDIR)/omap-common/libomap-common.o