overo: Set IEN on GPMC_CLK to support synchronous clocking.

Without this change CS's configured for synchronous clocking cannot
read data.

Signed-off-by: Philip Balister <philip@opensdr.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

board/overo/overo.h

@@ -119,7 +119,7 @@ const omap3_sysinfo sysinfo = {
 	MUX_VAL(CP(GPMC_NCS6),		(IEN  | PTD | DIS | M0)) /*GPMC_nCS6*/\
 	MUX_VAL(CP(GPMC_NCS7),		(IEN  | PTU | EN  | M0)) /*GPMC_nCS7*/\
 	MUX_VAL(CP(GPMC_NBE1),		(IEN  | PTD | DIS | M0)) /*GPMC_nCS3*/\
-	MUX_VAL(CP(GPMC_CLK),		(IDIS | PTU | EN  | M0)) /*GPMC_CLK*/\
+	MUX_VAL(CP(GPMC_CLK),		(IEN  | PTU | EN  | M0)) /*GPMC_CLK*/\
 	MUX_VAL(CP(GPMC_NADV_ALE),	(IDIS | PTD | DIS | M0)) /*GPMC_nADV_ALE*/\
 	MUX_VAL(CP(GPMC_NOE),		(IDIS | PTD | DIS | M0)) /*GPMC_nOE*/\
 	MUX_VAL(CP(GPMC_NWE),		(IDIS | PTD | DIS | M0)) /*GPMC_nWE*/\