umpf: do not set PV in series.inc

Since most recipes tend to use PV in their SRC_URI and we cannot set it
as a default value ('?='), it is the safest way to not set it
automatically from series.inc.

Users who want to have UMPF_VERSION as part of the yocto package version
can manually set PV to

  PV = "${UMPF_BASE}-${UMPF_VERSION}

at an appropriate location within the recipe.

Signed-off-by: Enrico Jörns <ejo@pengutronix.de>

umpf

@@ -1418,7 +1418,9 @@ format_patch_end() {
 		local base_name="$(<"${STATE}/base-name")"
 		echo "UMPF_BASE = \"${base_name//v/}\"" >&${series_out}
 		echo "UMPF_VERSION = \"$(<"${STATE}/version")\"" >&${series_out}
-		echo "PV = \"\${UMPF_BASE}-\${UMPF_VERSION}\"" >&${series_out}
+		echo "# To have UMPF_VERSION as part of the package version" >&${series_out}
+		echo "# you can manually set in you recipe:" >&${series_out}
+		echo "# PV = \"\${UMPF_BASE}-\${UMPF_VERSION}\"" >&${series_out}
 		if [ "$(head -n 1 README 2>/dev/null)" = "Linux kernel" ]; then
 			echo "LINUX_VERSION = \"\${UMPF_BASE}\"" >&${series_out}
 		fi