msm: kgsl: Disable the IOMMU clocks on a timestamp

Add a function which adds an event to disable the iommu clocks
based on a timestamp. If timestamp elapses then the event function
will disable the iommu clocks. Remove the disabling of iommu clocks
from the power control code.

Change-Id: Ic1263771f8c532131059283dde05425a73554974
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>
diff --git a/drivers/gpu/msm/kgsl_gpummu.c b/drivers/gpu/msm/kgsl_gpummu.c
index 429d035..d9fe3c6 100644
--- a/drivers/gpu/msm/kgsl_gpummu.c
+++ b/drivers/gpu/msm/kgsl_gpummu.c
@@ -729,7 +729,7 @@
 	.mmu_pagefault = kgsl_gpummu_pagefault,
 	.mmu_get_current_ptbase = kgsl_gpummu_get_current_ptbase,
 	.mmu_enable_clk = NULL,
-	.mmu_disable_clk = NULL,
+	.mmu_disable_clk_on_ts = NULL,
 	.mmu_get_hwpagetable_asid = NULL,
 	.mmu_get_pt_lsb = NULL,
 	.mmu_get_reg_map_desc = NULL,