pointercal: Add license checksum

Signed-off-by: Zhai Edwin <edwin.zhai@intel.com>

meta/recipes-bsp/pointercal/files/COPYING

@@ -0,0 +1,2 @@
+This is a blank COPYING file, and should be filled in by original author in future.
+

meta/recipes-bsp/pointercal/pointercal_0.0.bb

@@ -2,8 +2,11 @@ DESCRIPTION = "Touchscreen calibration data"
 SECTION = "base"
 PR = "r11"
 LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://COPYING;md5=4b5fcfc87fb615860d398b5e38685edf"
+
+SRC_URI = "file://pointercal \
+           file://COPYING"
 
-SRC_URI = "file://pointercal"
 S = "${WORKDIR}"
 
 do_install() {