omap4: Use a smaller M,N couple for IVA DPLL

This reduced M,N couple corresponds to the advised value from
TI HW team.

Tested on 4460 Pandaboard, it also provides peripheral clocks
closer to the advised values.

Signed-off-by: Sebastien Jan <s-jan@ti.com>
diff --git a/arch/arm/cpu/armv7/omap4/clocks.c b/arch/arm/cpu/armv7/omap4/clocks.c
index c568951..1d92e66 100644
--- a/arch/arm/cpu/armv7/omap4/clocks.c
+++ b/arch/arm/cpu/armv7/omap4/clocks.c
@@ -146,7 +146,7 @@
 	{727, 14, -1, -1, 4, 7, -1, -1},	/* 19.2 MHz */
 	{931, 25, -1, -1, 4, 7, -1, -1},	/* 26 MHz   */
 	{931, 26, -1, -1, 4, 7, -1, -1},	/* 27 MHz   */
-	{412, 16, -1, -1, 4, 7, -1, -1}		/* 38.4 MHz */
+	{291, 11, -1, -1, 4, 7, -1, -1}		/* 38.4 MHz */
 };
 
 /* ABE M & N values with sys_clk as source */