drm/radeon: implement common cs packet parse function

CS packet parse functions have a lot of in common across
all ASICs. Implement a common function and take care of
small differences between families inside the function.

This patch is a prep for major refactoring and consolidation
of CS parsing code.

Signed-off-by: Ilija Hadzic <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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