drm/amd/display: Rename program_timing function for better debugging

[WHY]
Improve the output when using the ftrace debug feature,
making it easier to identify which function is currently being executed.

[HOW]
Rename the program_timing function to a name that
includes the path to the function's file.

Signed-off-by: Antonio Fernando Silva e Cruz Filho <fernando.cruz.ctt@gmail.com>
Co-developed-by: André Nogueira Ribeiro <r.andrenogueira@gmail.com>
Signed-off-by: André Nogueira Ribeiro <r.andrenogueira@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>