dra7xx cpu frequency change

dra7xx MPU 调整：
1. Uboot the patches as below:

diff --git a/arch/arm/cpu/armv7/omap5/hw_data.c b/arch/arm/cpu/armv7/omap5/hw_data.c
index ae25a74..d062708 100644
--- a/arch/arm/cpu/armv7/omap5/hw_data.c
+++ b/arch/arm/cpu/armv7/omap5/hw_data.c
@@ -42,7 +42,7 @@ static const struct dpll_params mpu_dpll_params_800mhz[NUM_SYS_CLKS] = {
/* OPP NOM FREQUENCY for OMAP5 ES2.0, and DRA7 ES1.0 */
static const struct dpll_params mpu_dpll_params_1ghz[NUM_SYS_CLKS] = {
	{250, 2, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1},		/* 12 MHz   */
-	{500, 9, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1},		/* 20 MHz   */
+	{400, 9, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1},		/* 20 MHz   */
	{119, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1},		/* 16.8 MHz */
	{625, 11, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1},	/* 19.2 MHz */
	{500, 12, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1},	/* 26 MHz   */
@@ -718,7 +718,7 @@ const struct ctrl_ioregs ioregs_dra72x_es2 = {

2. kernel:  the patches as below:

diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
index 4fa2eed..852f74a 100644
--- a/arch/arm/boot/dts/dra7.dtsi
+++ b/arch/arm/boot/dts/dra7.dtsi
@@ -102,8 +102,8 @@
 		compatible = "operating-points-v2";
 		opp-shared;
 
-		opp_nom@1000000000 {
-			opp-hz = /bits/ 64 <1000000000>;
+		opp_nom@800000000 {
+			opp-hz = /bits/ 64 <800000000>;
 			opp-microvolt = <1060000 850000 1150000>;
 			opp-supported-hw = <0xFF 0x01>;
 			opp-suspend;

3. test 

1. mhz
root@dra7xx-evm:~# mhz
800 MHz, 1.2500 nanosec clock

2.get cur
root@dra7xx-evm:~#  cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq
800000

for multi operation point:
please remove more point, leaving one point can work.