Refine the description of the ambientbacklight parameter

vZonesNumber, hZonesNumber

Change the type of zonesColors from int array to union of ambientbacklight color
format array.

Test: m on cuttlefish
Flag: android.media.tv.flags.media_quality_fw
Bug: 375472716

Change-Id: Ie4221a7355982f09c43eaeb5000bf66e184f4910