ASoC: Add pincontrol support for PMI clk in audio ext clock

Use pincontrol framework to enable and disable
PMI clk pins instead of PMIC gpios.
Update wcd9xxx-soc to use downstream or upstream clock
based on the clock config enabled.

CRs-Fixed: 2165343
Change-Id: Iddbb9bfaaf384ccfe3396b28cd2da52aeb1b0a34
Signed-off-by: Soumya Managoli <smanag@codeaurora.org>