systemd: mount the EFI variable filesystem

Add efivarfs to the mount_table in mount-setup.c, so the EFI variable
filesystem will be mounted when systemd executed.

The EFI variable filesystem will merge in v3.7 or v3.8 linux kernel.

Cc: Kay Sievers <kay@vrfy.org>
Cc: Lennart Poettering <lennart@poettering.net>
Cc: Mantas Mikulėnas <grawity@gmail.com>
Cc: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Cc: Matt Fleming <matt.fleming@intel.com>
Cc: Jeremy Kerr <jeremy.kerr@canonical.com>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Lee, Chun-Yi <jlee@suse.com>

src/core/kmod-setup.c

@@ -31,9 +31,10 @@
 #include "kmod-setup.h"
 
 static const char * const kmod_table[] = {
-        "autofs4", "/sys/class/misc/autofs",
-        "ipv6",    "/sys/module/ipv6",
-        "unix",    "/proc/net/unix"
+        "autofs4",  "/sys/class/misc/autofs",
+        "ipv6",     "/sys/module/ipv6",
+        "efivarfs", "/sys/firmware/efi/efivars",
+        "unix",     "/proc/net/unix"
 };
 
 #pragma GCC diagnostic push