msm: kgsl: Fix to record NR_KERNEL_MISC_RECLAIMABLE in page units

Currently NR_KERNEL_MISC_RECLAIMABLE is being updated with units of bytes.
Fix to correclty update NR_KERNEL_MISC_RECLAIMABLE using page units.

Change-Id: I04afe798716f7352e12a51a6c1d9e4a6f8709308
Signed-off-by: Liam Mark <lmark@codeaurora.org>