kernel-install: remove EFI variant of BLS dirs too

Remove also EFI version of BootLoader Specification dirs. This will:
- really force to re-generate initramfs during installation, after all
relevant configs are updated; previously, dracut (called by anaconda
through kernel-install) refuse to update already existing
/boot/efi/.../initrd file.
- save some precious space in /boot/efi

Fixes QubesOS/qubes-issues#3234

(cherry picked from commit 53730c4ba2)

system-config/kernel-remove-bls.install

@@ -13,3 +13,9 @@
 if [[ $MACHINE_ID ]] && ( [[ -d /boot/${MACHINE_ID} ]] || [[ -L /boot/${MACHINE_ID} ]] ); then
     rm -rf /boot/${MACHINE_ID}
 fi
+if [[ $MACHINE_ID ]] && ( [[ -d /boot/efi/${MACHINE_ID} ]] || [[ -L /boot/efi/${MACHINE_ID} ]] ); then
+    rm -rf /boot/efi/${MACHINE_ID}
+    rm -f /boot/efi/loader/entries/${MACHINE_ID}-*.conf
+    # remove only when empty
+    rmdir /boot/efi/loader/entries /boot/efi/loader || :
+fi