Add support for Latvian (qwerty) keyboard mapping

Add kcm mapping files for Latvian keyboard layout
based on US-international keylayout (qwerty).

Change-Id: I667081d3e7bb0ece3b278da3f97926f54c319ff8
Signed-off-by: Olivier Gay <ogay@logitech.com>
Signed-off-by: Myriam Douve <mdouve@logitech.com>
Signed-off-by: Mathieu Meisser <mmeisser@logitech.com>