arm: mxs: add mmc-device for mach-tx28

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
diff --git a/arch/arm/mach-mxs/Kconfig b/arch/arm/mach-mxs/Kconfig
index 1d3985f..4cd0231 100644
--- a/arch/arm/mach-mxs/Kconfig
+++ b/arch/arm/mach-mxs/Kconfig
@@ -61,6 +61,7 @@
 	select MXS_HAVE_PLATFORM_AUART
 	select MXS_HAVE_PLATFORM_FEC
 	select MXS_HAVE_PLATFORM_MXS_I2C
+	select MXS_HAVE_PLATFORM_MXS_MMC
 	select MXS_HAVE_PLATFORM_MXS_PWM
 
 config MACH_TX28