OMAP3 MMC: Fix warning dereferencing type-punned pointer

Fix warning
Dereferencing type-punned pointer will break strict-aliasing rules

Signed-off-by: Dirk Behme <dirk.behme@googlemail.com>
CC: Steve Sakoman <sakoman@gmail.com>
Acked-by: Tom Rix <Tom.Rix@windriver.com>
diff --git a/include/asm-arm/arch-omap3/mmc.h b/include/asm-arm/arch-omap3/mmc.h
index 55584d9..196ffdc 100644
--- a/include/asm-arm/arch-omap3/mmc.h
+++ b/include/asm-arm/arch-omap3/mmc.h
@@ -223,6 +223,13 @@
 	unsigned short newpublishedrca;
 } mmc_resp_r6;
 
+typedef union {
+	unsigned int resp[4];
+	mmc_resp_r3 r3;
+	mmc_resp_r6 r6;
+	mmc_csd_reg_t Card_CSD;
+} mmc_resp_t;
+
 extern mmc_card_data mmc_dev;
 
 unsigned char mmc_lowlevel_init(void);