Add support for minimized mode for right dock side for tablets (1/2)

Tablets have the ability to dock to the right side in landscape. This
change supports minimized mode for right dock side.

Test: run-test CtsActivityManagerDeviceTestCases
android.server.am.ActivityManagerDockedStackTests#
testMinimizedFromEachDockedSide
Change-Id: Ie879bdf7bf74226c0ceda9295f9de2004fd6a9b5
Fixes: 68017311