arm64: defconfig: Enable the PMIC and regulator for Hi6220 and 96boards HiKey

This patch enables a number of devices currently supported by the Hi6220
and 96boards HiKey. These include
a) Hi655x PMIC and regulator
b) Hi6220 I2C, USB, MMC, mailbox, and reset
c) CONFIG_PINCTRL_SINGLE, and CONFIG_LEDS_GPIO

Since b) and c) are already in the 4.6-rc3, so kept a) only in this
patch and updated subject as well.

v2:
 - rebase to next-20160310, CONFIG_MMC_BLOCK_MINORS=16 is already in.
 - set CONFIG_I2C_DESIGNWARE_PLATFORM to be build as module
Signed-off-by: NGuodong Xu <guodong.xu@linaro.org>
Reviewed-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NWei Xu <xuwei5@hisilicon.com>

arch/arm64/configs/defconfig

@@ -173,8 +173,10 @@ CONFIG_THERMAL_EMULATION=y
 CONFIG_EXYNOS_THERMAL=y
 CONFIG_MFD_SPMI_PMIC=y
 CONFIG_MFD_SEC_CORE=y
+CONFIG_MFD_HI655X_PMIC=y
 CONFIG_REGULATOR=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
+CONFIG_REGULATOR_HI655X=y
 CONFIG_REGULATOR_QCOM_SMD_RPM=y
 CONFIG_REGULATOR_QCOM_SPMI=y
 CONFIG_REGULATOR_S2MPS11=y