pixman: Trim license info extracted from pixman-matrix.c

Four unrelated lines were extracted from pixman-matrix.c for the
license information.

License-Update: Only extract the relevant part from pixman-matrix.c
(From OE-Core rev: d0a209e8cf29d982567e3978e1dcbb3871505a39)

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/xorg-lib/pixman_0.34.0.bb

@@ -12,7 +12,7 @@ UPSTREAM_CHECK_REGEX = "pixman-(?P<pver>\d+\.(\d*[02468])+(\.\d+)+)"
 
 LICENSE = "MIT & MIT-style & PD"
 LIC_FILES_CHKSUM = "file://COPYING;md5=14096c769ae0cbb5fcb94ec468be11b3 \
-                    file://pixman/pixman-matrix.c;endline=25;md5=ba6e8769bfaaee2c41698755af04c4be \
+                    file://pixman/pixman-matrix.c;endline=21;md5=4a018dff3e4e25302724c88ff95c2456 \
                     file://pixman/pixman-arm-neon-asm.h;endline=24;md5=9a9cc1e51abbf1da58f4d9528ec9d49b \
                    "
 DEPENDS += "zlib libpng"