ARM: DRA7xx: Correct the SYS_CLK to 20MHZ

The sys_clk on the dra evm board is 20MHZ.
Changing the configuration for the same.
And also moving V_SCLK, V_OSCK defines to
arch/clock.h for OMAP4+ boards.

Signed-off-by: Sricharan R <r.sricharan@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/arch/arm/include/asm/arch-omap4/clock.h b/arch/arm/include/asm/arch-omap4/clock.h
index f544edf..d7b61c2 100644
--- a/arch/arm/include/asm/arch-omap4/clock.h
+++ b/arch/arm/include/asm/arch-omap4/clock.h
@@ -214,6 +214,10 @@
 #define DPLL_NO_LOCK	0
 #define DPLL_LOCK	1
 
+/* Clock Defines */
+#define V_OSCK			38400000	/* Clock output from T2 */
+#define V_SCLK                   V_OSCK
+
 struct omap4_scrm_regs {
 	u32 revision;           /* 0x0000 */
 	u32 pad00[63];