recipes: pre/post actions

A number of the recipes did not properly label their pre and post
actions, causing the actions to occur in all split packages.  This
was corrected by defaulting to _${PN} in most cases.

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>

meta/recipes-bsp/hostap/hostap-conf_1.0.bb

@@ -19,13 +19,13 @@ do_install() {
 	install -m 0644 ${WORKDIR}/hostap_cs.modalias ${D}${sysconfdir}/modutils/hostap_cs.conf
 }
 
-pkg_postinst () {
+pkg_postinst_${PN} () {
 	if [ -n "$D" ]; then
 		exit 1
 	fi
 	update-modules || true
 }
 
-pkg_postrm () {
+pkg_postrm_${PN} () {
 	update-modules || true
 }