msm: kgsl: In kgsl release do not idle if device is in HUNG state

When recovery fails we are in HUNG state and clocks are turned off,
If a client closes kgsl device, driver release gets called and
we will try to idle the device which leads to accessing GPU registers
without clock being on. This leads to excessive kernel logging
"kgsl_pre_hwaccess hw access while clocks off from state HUNG"
and this eventually leads to watchdog.

CRs-fixed: 397149
Change-Id: Iac720bef5d811269417ec1e5a346c95ce5a4324f
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>