msm: kgsl: fix a5x ucode version check

The check for per-process pagetable support was comparing
the loaded pm4 version against the expected pfp version.
The check to compare both versions was logical and instead of
logical or.  Last but not least, the code to read the version
from the firmware file only read 1 byte instead of 4.

Change-Id: Ic35f82da73bccfc6b67f72c212f2d1c2c5883ced
Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>