ENGR00221102-1 MX6Q: increase VPU frequence to 352Mhz

Increase VPU frequency to 352Mhz for TV box, use pll2_pfd_400M.To avoid impact
other code which assume ARM clock sourcing from pll2_pfd_400M, change cpu
setpoint of 396M to 352M. and disable bus freq adjust.
add CONFIG_MX6_VPU_352M to choose it, default is disabled.
Signed-off-by: Robin Gong <B38343@freescale.com>

drivers/mxc/vpu/Kconfig

@@ -19,4 +19,13 @@ config MXC_VPU_DEBUG
 	  This is an option for the developers; most people should
 	  say N here.  This enables MXC VPU driver debugging.
 
+config MX6_VPU_352M
+	bool "MX6 VPU 352M"
+	depends on MXC_VPU
+	default n
+	help
+	 Increase VPU frequncy to 352M, the config will disable bus frequency
+	 adjust dynamic, and CPU lowest setpoint will be 352Mhz.
+	 This config is used for special VPU use case.
+
 endmenu