msm_otg: move ID_A forcing to ACA detect. undo proprietary checks
Move ID_A forcing to ACA detect so that automatic host mode can be disabled by disabling ACA (# echo disable > /sys/kernel/debug/msm_otg/aca).
No longer need to simulate ACA since ACA will now be REQUIRED for host mode.
Remove test cases for actual proprietary chargers since they were causing false positives (manually disable ACA to use proprietary chargers).