Fix broken MenuItem coretests

- Fix MenuItemImpl setShortcut bug caused when method signature was
changed after API review
- Remove outdated MenuItem coretests and move others to CTS

Bug: 38114634
Test: Run `cts-tradefed run cts-dev -m CtsViewTestCases -t
android.view.cts.MenuTest`

Change-Id: Iebb7e314cbb3f812fcfeb3f95797f1cf1bcfbae2
(cherry picked from commit d70d2e6e)