msm: kgsl: enable CPU IRQ while suspending context

Make sure that CPU interrupt is enabled before calling adreno
suspend_context when moving from NAP/SLEEP to SUSPEND state.
We send commands to GPU in adreno_drawctxt_switch() which will generate
GPU interrupt. Since CPU interrupt is not enabled, adreno_idle() will
fail because pending interrupt will not be served by CPU this causes
false GPU hang.

Signed-off-by: Prakash Kamliya <pkamliya@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>