drm/amd/display: add i2c_hw_Status check to make sure as HW I2c in use

1. Add i2c_hw_Status check to make sure when HW i2c is in use.
2. Don't reset HW engine in is_hw_busy() and instead do this in
process_transaction() because SW i2c does not check if hw i2c is in use

Signed-off-by: Derek Lai <Derek.Lai@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>