hwmon: pm8xxx_adc: Remove pm8921-adc
hwmon: pm8xxx_adc: Remove pm8921-adc

Switch clients to use pm8xxx-adc and remove pm8921-adc.
pm8xxx-adc supports PMIC HK/XOADC for 8960, 9x15, 8064
platforms.

Change-Id: Id27fa908cc097d52e6033c28ce243c6bcf64ed27
Signed-off-by: Siddartha Mohanadoss <9c97603a3a6be1a8a5dd7a9c9672e79ad0487bf3@codeaurora.org>
Signed-off-by: David Brown <67bb63793f66c3c3797af10faa739beca3aeb927@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas