nitrogen: enable HID_MULTITOUCH kernel module

Used with GeChic multitouch monitors

Change-Id: If6652a32f0cf7cacc0e23c26cc1fdac7aa67ef54
Task-number: QTAUTO-230
Reviewed-by: Teemu Holappa <teemu.holappa@theqtcompany.com>

meta-fsl-extras/recipes/linux/linux-boundary_3.14.%.bbappend

@@ -34,3 +34,7 @@ SRC_URI += " \
 
 # kernel image files are not needed in the image
 RDEPENDS_kernel-base = ""
+
+do_configure_prepend() {
+    echo "CONFIG_HID_MULTITOUCH=m"              >> ${WORKDIR}/defconfig
+}