asoc: bolero: check if clock is enabled before accessing register

Reset GFMUX reg for va-macro and wsa-macro when adsp is up
after SSR. And check if clock is enabled before accessing
register to avoid kernel panic.

Change-Id: Idce9695be552cab0e8e389cf72eeb7a67a754bf9
Signed-off-by: Meng Wang <mengw@codeaurora.org>