drm/amd: Parse both v1 and v2 TA microcode headers using same function

Several IP versions duplicate code and can't use the common helpers.
Move this code into a single function so that the helpers can be used.

v2: squash in fix from Mario to remove duplicate ta parsing

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>