freedreno/kgsl: fix pointer-to-int cast

Fixes this warning:

freedreno/kgsl/kgsl_ringbuffer.c: In function ‘kgsl_ringbuffer_flush’:
freedreno/kgsl/kgsl_ringbuffer.c:149:19: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
   req.timestamp = (uint32_t)kgsl_ring->bo->hostptr;
                   ^

Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
diff --git a/freedreno/kgsl/kgsl_ringbuffer.c b/freedreno/kgsl/kgsl_ringbuffer.c
index e4696b1..f09c433 100644
--- a/freedreno/kgsl/kgsl_ringbuffer.c
+++ b/freedreno/kgsl/kgsl_ringbuffer.c
@@ -146,7 +146,7 @@
 		ibdesc.gpuaddr = kgsl_ring->bo->gpuaddr;
 		ibdesc.hostptr = kgsl_ring->bo->hostptr;
 		ibdesc.sizedwords = 0x145;
-		req.timestamp = (uint32_t)kgsl_ring->bo->hostptr;
+		req.timestamp = (uintptr_t)kgsl_ring->bo->hostptr;
 	}
 
 	do {