This consolidates all of the information that was in the native
KeyEvent and the KeyLayout files into the managed KeyEvent class.
It also moves the definition for all of the key names to the native
side, rather than having them in both places.
Change-Id: I172e3b554e7eb52c79ae2ec406ef4332e8b25ffa
Also added a validation tool for keymaps (not currently integrated
into the build system but getting there).
This change brings back Android.mk with the intent that it will
be used to validate keymaps in a later change.
Added some missing keys that are present on phones.
Bug: 3215210
Bug: 3225421
Change-Id: Id817c6e2215164616942c51a42752915d9ceacd3