xlnx-embeddedsw: Move PV to append
It is possible for a recipe that uses this class to have a different version
then ESW_VER.  Instead of replacing the defined version, just append out git
information.
This ensures that PREFERRED_VERSION and other version specific behavior
remain as intented.
@@ -20,4 +20,4 @@ LIC_FILES_CHKSUM[xlnx_rel_v2022.2] = 'ce611484168a6000bd35df68fc4f4290'
LIC_FILES_CHKSUM ??= "file://license.txt;md5=${@d.getVarFlag('LIC_FILES_CHKSUM', d.getVar('BRANCH')) or '0'}"
SRC_URI = "${EMBEDDEDSW_SRCURI}"
-PV = "${ESW_VER}+git${SRCPV}"
+PV .= "+git${SRCPV}"
