msm: kgsl: Add per context fault properties

Add per-context properties to count the number of faults
for each context. This will help out to identify faulting
context really faulted on its own command or not.

Change-Id: Ifd74e32f1f95a345645c10c01c33c5ef14bdcbcd
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>