initramfs-framework: Allow directories with spaces

When mdev module loads the Linux kernel modules, it can visit
directories with spaces. To allow that, we must quote the variable
otherwise it misunderstand it arguments as multiple entries.

Fixes:

,----
| Freeing unused kernel memory: 3072K (80d00000 - 81000000)
| cat: can't open '/sys/devices/platform/Vivante': No such file or directory
| cat: can't open 'GCCore/modalias': No such file or directory
`----

(From OE-Core rev: afc73dd6346325de0a39997a3045b6659f9658b5)

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/initrdscripts/initramfs-framework/mdev

@@ -1,5 +1,5 @@
 #!/bin/sh
-# Copyright (C) 2011 O.S. Systems Software LTDA.
+# Copyright (C) 2011, 2017 O.S. Systems Software LTDA.
 # Licensed on MIT
 
 mdev_enabled() {
@@ -25,6 +25,6 @@ mdev_run() {
 
 	# load modules for devices
 	find /sys -name modalias | while read m; do
-		load_kernel_module $(cat $m)
+		load_kernel_module $(cat "$m")
 	done
 }