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: Ie7c30eb0a1aee58aa835133f0336f0164492d732
Signed-off-by: Da Hoon Pyun <dpyun@codeaurora.org>