msm: kgsl: Remove sysfs entries after releasing memory

Consider a scenario when device is in OOM situation. Assume a process is
doing sysfs operation, grabs kernfs_mutex and wants to allocate memory.
LMKD tries to kill processes but kgsl processes will be blocked waiting
for kernfs_mutex in sysfs_remove_file.

kgsl_process_private_close > kgsl_process_uninit_sysfs > sysfs_remove_file

KGSL won't free up memory as it is done after sysfs removal leading to a
livelock. Fix it by releasing memory before removing sysfs entries.

Change-Id: I99640d7a653faffa671d5b035abb78e9473da12e
Signed-off-by: Kamal Agrawal <kamaagra@codeaurora.org>