asoc: codecs: re-factor audio-ext-clk driver

Re-factor audio clock driver to register one clock at a time
and remove duplicate lpass clocks.

Change-Id: I63ddf4b65ec7e9cda0dcad4e0167cd8636e89e1a
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>