gpu: Check error during drivers initialization

Add a boolean return value to driver's `init_perfcnt()` function to
tell whether the initialization has been successful or not.

Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>
3 jobs for check-init in 3 minutes and 19 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Check
passed #5820291
clang-format

00:01:28

 
  Build
passed #5820293
aarch64
aarch64

00:01:50

passed #5820292
kvm
x86_64

00:00:46