msm: npu: Unvote bandwidth after turning off GDSC

While GDSP is turned off, it requires bandwidth to be voted to
save some information to memory. This change is to move bandwidth
unvoting after turning off GDSC.

Change-Id: I99ac6ce538d643e9f15e0e6e6d3cecad21d504bb
Signed-off-by: Jilai Wang <jilaiw@codeaurora.org>