mxt640U: Add mxt-app to buildsystem

The application is needed for the tuning of the mxT640U touch controller.

BCS 746-000726

recipes-utils/mxt-app/mxt-app_git.bb

+DESCRIPTION = "Command line utility for maXTouch devices"
+SECTION = "tools"
+HOMEPAGE = "https://github.com/atmel-maxtouch/mxt-app"
+LICENSE = "BSD-2-Clause"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=8b6acde4490765c7b838377ac61e2d2d"
+
+DEPENDS = "libusb1"
+
+PV = "1.36+git${SRCPV}"
+
+inherit autotools
+
+SRCREV="5700074206140c501dd3e7d7ff8a1ee9de9079d5"
+SRC_URI = "git://github.com/atmel-maxtouch/mxt-app.git;branch=master;protocol=https"
+
+S = "${WORKDIR}/git"