msm: kgsl: Don't disable isense during recovery

GPU isense is managed by gmu. So let gmu handle isense completely
and avoid disabling isense during the recovery for A6x GPUs.

Change-Id: I64c89f7f73b4e341690f27e734a83d7fa0a815e9
Signed-off-by: Akhil P Oommen <akhilpo@codeaurora.org>