MMC: Remove HIGHMEM dependency from mmc-spi driver

I cannot see why this is needed. kmap() should be safe in this case.
Signed-off-by: NIan Molton <ian@mnementh.co.uk>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/Kconfig

@@ -503,7 +503,7 @@ config MMC_GOLDFISH
 
 config MMC_SPI
 	tristate "MMC/SD/SDIO over SPI"
-	depends on SPI_MASTER && !HIGHMEM && HAS_DMA
+	depends on SPI_MASTER && HAS_DMA
 	select CRC7
 	select CRC_ITU_T
 	help