[2/n] Add adb command for override user aspect ratio settings flag

Add ADB command to override the build time flag for user aspect
ratio settings.

adb shell wm set-letterbox-style
        --isUserAppAspectRatioSettingsEnabled [true|1|false|0]

Bug: 287448178
Test: Manual

Change-Id: Ibf347745a0be6294211bf2b6e0a3348d87eb29e7