msm: kgsl: Add context reference counting to KGSL events
msm: kgsl: Add context reference counting to KGSL events

Add reference counting to all KGSL events since they are dependent
on the context.  This avoids a race condition where the context
could be destroyed while the events are being processed during cleanup.

CRs-fixed: 438134
Change-Id: Ic2cd484d441e4c392ab63b0a0131accaceafc711
Signed-off-by: Carter Cooper <ff1e5ded47dd5c88716d0ac2f671fd3e0c0ebc6d@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas