drm/radeon/radeon_i2c: Remove unused function

Remove the function radeon_best_encoder() that is not used anywhere.

This was partially found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --cc drivers/gpu/drm/radeon/radeon_i2c.c
Simple merge

diff --cc drivers/gpu/drm/radeon/radeon_mode.h
Simple merge