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.

Signed-off-by: Kiran Kandi <kkandi@codeaurora.org>
(cherry picked from commit 4c56c594)

Change-Id: I5c269a917427cef918e06eb4599383fd725c3a92
Signed-off-by: Sudhir Sharma <sudsha@codeaurora.org>