Phase out config_roundedCornerMultipleRadius

With phasing out config_roundedCornerMultipleRadius, the existence of
top/bottom rounded corners will depend on getRoundedCornerRadius(),
getRoundedCornerTopRadius(), or getRoundedCornerBottomRadius() of
RoundedCorners class.

The rounded corner sizes will also be simplified to use drawable size as
well.

Bug: 224688507
Test: atest ScreenDecorationsTest RoundedCornerResDelegateTest \
      RoundedCornerDecorProviderFactoryTest ScreenDecorHwcLayerTest
Change-Id: I5b28683bb5cd649b6401627910f4adacf4a2bc22