wcnss: Configure VDD_PA voltage based on vadc feature

Configure VDD_PA to 3.0V if vadc feature supported
and if read battery voltage is less than threshold
voltage, otherwise configure VDD_PA to 3.3V.

CRs-Fixed: 867446
Change-Id: Id49643cef214958c8d73e46114d613b72d6c1de6
Signed-off-by: Anand N Sunkad <asunka@codeaurora.org>