WCD9320: Add support for class H controller

The class H controller is embedded in the digital hardware.
Its purpose is to analyze the signal which will be sent to
the PAs (EAR or HPHL/HPHR) to adjust the supply voltage of
the PA to make the system as efficient as possible.

Change-Id: I487f8bc8c2bc841c9222dfeb81ac94708399829b
Signed-off-by: Kiran Kandi <kkandi@codeaurora.org>