recipes: Drop remaining PR values from recipes

* as oe-core did in:
  https://git.openembedded.org/openembedded-core/commit/?id=d4c346e8ab

* when people are have to maintain own PRs for recipes in oe-core, they
  might add them for meta-oe recipes at the same time when upgrading
  to next LTS

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-multimedia/id3lib/id3lib_3.8.3.bb

@@ -4,7 +4,6 @@ LICENSE = "LGPL-2.0-or-later"
 LIC_FILES_CHKSUM = "file://COPYING;md5=3bf50002aefd002f49e7bb854063f7e7"
 DEPENDS = "zlib"
 
-PR = "r1"
 
 SRC_URI = "${SOURCEFORGE_MIRROR}/id3lib/id3lib-${PV}.tar.gz;name=archive \
            ${DEBIAN_MIRROR}/main/i/id3lib3.8.3/id3lib3.8.3_3.8.3-16.2.debian.tar.xz;name=patch;subdir=${BP} \

meta-oe/recipes-multimedia/libid3tag/libid3tag_0.15.1b.bb

@@ -7,7 +7,6 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=94d55d512a9ba36caa9b7df079bae19f \
 			file://version.h;beginline=1;endline=8;md5=86ac68b67f054b7afde9e149bbc3fe63"
 SECTION = "libs"
 DEPENDS = "zlib gperf-native"
-PR = "r7"
 
 SRC_URI = "${SOURCEFORGE_MIRROR}/mad/libid3tag-${PV}.tar.gz \
            file://addpkgconfig.patch \

meta-oe/recipes-multimedia/libmad/libmad_0.15.1b.bb

@@ -8,7 +8,6 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=94d55d512a9ba36caa9b7df079bae19f \
     file://version.h;beginline=1;endline=8;md5=aa07311dd39288d4349f28e1de516454"
 SECTION = "libs"
 DEPENDS = "libid3tag"
-PR = "r3"
 
 SRC_URI = "ftp://ftp.mars.org/pub/mpeg/libmad-${PV}.tar.gz \
     file://no-force-mem.patch \

meta-oe/recipes-multimedia/v4l2apps/yavta_git.bb

@@ -7,7 +7,6 @@ SRC_URI = "git://git.ideasonboard.org/yavta.git;branch=master \
 SRCREV = "65f740aa1758531fd810339bc1b7d1d33666e28a"
 
 PV = "0.0"
-PR = "r2"
 S = "${WORKDIR}/git"
 
 EXTRA_OEMAKE = "-e MAKEFLAGS="