drm/msm/a5xx: add devcoredump support to the fault handler

Use adreno_fault_handler() to implement a5xx_fault_handler(). This
enables devcoredump support on a5xx platforms, allowing one to capture
the crashed GPU state at the time of context fault.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/522724/
Link: https://lore.kernel.org/r/20230214123504.3729522-4-dmitry.baryshkov@linaro.org
Signed-off-by: Rob Clark <robdclark@chromium.org>