recovery-initramfs: correctly set environment variables containing spaces

In the libubootenv implementation of fw_setenv, multiple variables can be set
in one call. When setting a variable with a space-separated list, the app
interprets the list as new variable/value tuples, for example:

    fw_setenv myvar value1 value2 value3

Results in:

    myvar=value1
    value2=value3

This was causing the encrypted eMMC partition mechanism to break, because the
list of encrypted partitions is stored as a space-separated list in an
environment variable. Avoid this by enclosing the variable argument of
set_uboot_var() with double quotes.

Signed-off-by: Gabriel Valcazar <gabriel.valcazar@digi.com>

meta-digi-dey/recipes-core/recovery/recovery-initramfs/recovery-initramfs-init

@@ -110,7 +110,7 @@ read_uboot_var() {
 # @param ${2}  - Value to set.
 #------------------------------------------------------------------------------
 set_uboot_var() {
-	fw_setenv ${1} ${2} 2>/dev/null
+	fw_setenv ${1} "${2}" 2>/dev/null
 }
 
 #------------------------------------------------------------------------------