mmc: tmio: Fix build error without CONFIG_MMC_SDHI

Only compile tmio_mmc_dma.o when CONFIG_MMC_SDHI is selected (as y or m).
Signed-off-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/Makefile

@@ -32,9 +32,7 @@ obj-$(CONFIG_MMC_SDRICOH_CS)	+= sdricoh_cs.o
 obj-$(CONFIG_MMC_TMIO)		+= tmio_mmc.o
 obj-$(CONFIG_MMC_TMIO_CORE)	+= tmio_mmc_core.o
 tmio_mmc_core-y			:= tmio_mmc_pio.o
-ifneq ($(CONFIG_MMC_SDHI),n)
-tmio_mmc_core-y			+= tmio_mmc_dma.o
-endif
+tmio_mmc_core-$(subst m,y,$(CONFIG_MMC_SDHI))	+= tmio_mmc_dma.o
 obj-$(CONFIG_MMC_SDHI)		+= sh_mobile_sdhi.o
 obj-$(CONFIG_MMC_CB710)		+= cb710-mmc.o
 obj-$(CONFIG_MMC_VIA_SDMMC)	+= via-sdmmc.o