Downgrade AOSP r52 -> r27

The AP2A (QPR2) release is causing us too much issues: new lunch targets, different CTS/VTS behaviour, 4k playback regression, ...

Since we will switch back to an earlier AOSP baseline, we no longer need this change

This reverts commit e6f2701b.

Signed-off-by: Mattijs Korpershoek mkorpershoek@baylibre.com