1.set arm and logic voltage 0.9v in suspend;
2.defconfig add support charge display;
CONFIG_DDR_FREQ=y
# CONFIG_DDR_TEST is not set
CONFIG_RK_CLOCK_PROC=y
+CONFIG_CLK_SWITCH_TO_32K=y
+CONFIG_RK30_I2C_INSRAM=y
CONFIG_RK_USB_UART=y
CONFIG_MACH_RK3026_86V=y
CONFIG_ARM_ERRATA_761320=y
CONFIG_BATTERY_RK30_ADC_FAC=y
CONFIG_BATTERY_RK30_AC_CHARGE=y
CONFIG_BATTERY_RK30_VOL3V8=y
+CONFIG_POWER_ON_CHARGER_DISPLAY=y
# CONFIG_HWMON is not set
CONFIG_MFD_TPS65910=y
CONFIG_MFD_WM831X_I2C=y