hwmon: pm8921-adc: Add sysfs interface

-Add sysfs interface to read PM8921 HK/XOADC
and thermistor temperature measurements mapped
through MPP's.
-Move PM8921 ADC from directory /drivers/mfd to
/drivers/hwmon for userspace clients to read ADC
through hwmon.

CRs-Fixed: 302365
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>

Conflicts:

	drivers/mfd/Kconfig
diff --git a/arch/arm/configs/msm8960_defconfig b/arch/arm/configs/msm8960_defconfig
index d5f8f75..62213bd 100755
--- a/arch/arm/configs/msm8960_defconfig
+++ b/arch/arm/configs/msm8960_defconfig
@@ -260,12 +260,12 @@
 # CONFIG_BATTERY_MSM is not set
 CONFIG_PM8921_CHARGER=y
 CONFIG_PM8921_BMS=y
-# CONFIG_HWMON is not set
+CONFIG_HWMON=y
+CONFIG_SENSORS_PM8921_ADC=y
 CONFIG_THERMAL=y
 CONFIG_THERMAL_TSENS8960=y
 CONFIG_THERMAL_PM8XXX=y
 CONFIG_MFD_PM8921_CORE=y
-CONFIG_MFD_PM8921_ADC=y
 CONFIG_MFD_PM8XXX_BATT_ALARM=y
 CONFIG_WCD9310_CODEC=y
 CONFIG_REGULATOR_GPIO=y