Support tuning sysui_rounded_size

Previous sysui_rounded_size only works on device w/o rounded_corner_top
or rounded_corner_bottom. Support tuning sysui_rounded_size for all
cases.

Bug: 220659061
Test: atest RoundedCornerResDelegateTest
Test: Manually check rounded corner size on normal phone, hardware-layer
      phone with 'adb shell settings put secure sysui_rounded_size XX'
Change-Id: I1e16e93271ac81af99e51d62cf4035219a5e7070