drm/amd/display: add global master update lock interfaces

Add these interfacese for future use
setup_global_lock()
lock_global()
pipe_control_lock_global()

Signed-off-by: Wenjing Liu <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Bhawanpreet Lakha <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
2 files changed