omap3630: Set omap3630 MMC1 I/O speed to 52Mhz

The speed ctrl bit for MMC I/O is part of CONTROL_PROG_IO1 register
in omap3630.This patch sets it up accordingly.

Signed-off-by: Madhusudhan Chikkature <madhu.cr@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/plat-omap/include/plat/control.h b/arch/arm/plat-omap/include/plat/control.h
index 79985e4..2ae8843 100644
--- a/arch/arm/plat-omap/include/plat/control.h
+++ b/arch/arm/plat-omap/include/plat/control.h
@@ -241,6 +241,9 @@
 #define OMAP2_PBIASLITEPWRDNZ0		(1 << 1)
 #define OMAP2_PBIASLITEVMODE0		(1 << 0)
 
+/* CONTROL_PROG_IO1 bits */
+#define OMAP3630_PRG_SDMMC1_SPEEDCTRL	(1 << 20)
+
 /* CONTROL_IVA2_BOOTMOD bits */
 #define OMAP3_IVA2_BOOTMOD_SHIFT	0
 #define OMAP3_IVA2_BOOTMOD_MASK		(0xf << 0)