msm: kgsl: Fix overflow issue by checking user supplied count

User supplied count can cause signed integer overflow when passed to
dma_fence_array_create. So make sure that count is less than INT_MAX.

Change-Id: Ie6f57e06a8f23e9fdc10f8a368921b9ad3516eba
Signed-off-by: Puranam V G Tejaswi <pvgtejas@codeaurora.org>