spl: spi: Move the generic SPI loader into common/spl

All the other SPL loaders are in this directory, so move the SPI one in
there too.

There are two board-specific SPI loaders (fsl and sunxi). These remain in
the drivers/mtd/spi directory, since they do not contain generic code.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

common/spl/Makefile

@@ -25,4 +25,5 @@ obj-$(CONFIG_SPL_FAT_SUPPORT) += spl_fat.o
 obj-$(CONFIG_SPL_EXT_SUPPORT) += spl_ext.o
 obj-$(CONFIG_SPL_SATA_SUPPORT) += spl_sata.o
 obj-$(CONFIG_SPL_DFU_SUPPORT) += spl_dfu.o
+obj-$(CONFIG_SPL_SPI_LOAD) += spl_spi.o
 endif

drivers/mtd/spi/Makefile

@@ -8,7 +8,6 @@
 obj-$(CONFIG_DM_SPI_FLASH) += sf-uclass.o
 
 ifdef CONFIG_SPL_BUILD
-obj-$(CONFIG_SPL_SPI_LOAD)	+= spi_spl_load.o
 obj-$(CONFIG_SPL_SPI_BOOT)	+= fsl_espi_spl.o
 obj-$(CONFIG_SPL_SPI_SUNXI)	+= sunxi_spi_spl.o
 endif