meta-inspur: Cleanup for Yocto override syntax change

Refer to: https://lore.kernel.org/openbmc/YQ1FD5q8KbhbXVBK@heinlein/

```
poky/scripts/contrib/convert-overrides.py meta-inspur

git grep "_[a-z0-9_/-]*[ :]" -- meta-inspur | grep ".bb"

git grep -l _fp5280g2 -- meta-inspur | xargs sed -i \
's/_fp5280g2/:fp5280g2/'
git grep -l _on5263m5 -- meta-inspur | xargs sed -i \
's/_on5263m5/:on5263m5/'
git grep -l _virtual  -- meta-inspur | xargs sed -i \
's/_virtual/:virtual/'

```

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I5ef5039691caf5e33fb865da0fdd70d95d7e3bdf
diff --git a/meta-inspur/meta-fp5280g2/recipes-phosphor/mctp/mctp_%.bbappend b/meta-inspur/meta-fp5280g2/recipes-phosphor/mctp/mctp_%.bbappend
index b27014b..eedce86 100644
--- a/meta-inspur/meta-fp5280g2/recipes-phosphor/mctp/mctp_%.bbappend
+++ b/meta-inspur/meta-fp5280g2/recipes-phosphor/mctp/mctp_%.bbappend
@@ -1,8 +1,8 @@
-FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
 
 SRC_URI += "file://mctp"
 
-do_install_append() {
+do_install:append() {
 	install -d ${D}${sysconfdir}/default
 	install -m 0644 ${WORKDIR}/mctp ${D}${sysconfdir}/default/mctp
 }