Add dependency to extX utilities for diskpart

This will help to add extX filesystem initialization using the e2fsprogs
libraries.
Signed-off-by: Stefano Babic <sbabic@denx.de>

recipes-support/swupdate/swupdate.inc

@@ -172,7 +172,7 @@ python () {
         depends += ' zstd'
 
     if 'CONFIG_DISKPART=y\n' in features:
-        depends += ' util-linux'
+        depends += ' util-linux e2fsprogs'
 
     d.setVar('DEPENDS', depends)