Prepend relevant meta key names (such as Ctrl+) to the shortcut
displayed in a menu.
Do not prepend "Menu+" if the device does not have a hardware Menu key.
Bug: 31045453
Test: run ApiDemos (MenuInflateFromXml), select "Shortcuts", observe
Ctrl+ prepended to shortcuts.
Change-Id: I1a38bd1baf069dd1adb24a26f89c6db6390b8b8d
(cherry picked from commit 0cc2c6b190)