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. Change-Id: Ifcd9655a6335d22c01f2606a0fbc5346d9a0314f CRs-fixed: 438134 Signed-off-by: Carter Cooper <ccooper@codeaurora.org>