grub: Disable boot measurement for installer

This commit disables the boot measurement for the installer in order to speed up
the boot process.

Signed-off-by: Renê de Souza Pinto <rene@renesp.com.br>
(cherry picked from commit 326b7e9)

pkg/grub/rootfs.cfg

@@ -121,7 +121,9 @@ function set_rootfs_root {
    if [ -z "$rootfs_root" ]; then
       probe -s root_type --fs $root # do NOT try to probe netfs for part-uuid; grub crashes
       if [ "$root_type" != "netfs" ]; then
-         measurefs $root --pcr 13
+         if [ "$rootfs_title_suffix" != "-installer" ]; then
+             measurefs $root --pcr 13
+         fi
          probe --set partuuid --part-uuid $root
          set_global rootfs_root "PARTUUID=$partuuid"
       fi