[ALPS08748323] GPU:Fix eemgpus Security Vulnerability

[Description]
fix OOB in array aging_val of eemg_setmargin_proc_write

[Test]
No array OOB

MTK-Commit-Id: 1a0371b1d71c1f040afd44578c1f753723ecacc7

Change-Id: I249c456d5a162832bf323e71029f2cc84cc033ed
CR-Id: ALPS08748323
Feature: ARM GPU DDK driver
Signed-off-by: sourav.sardana <sourav.sardana@mediatek.com>