swupdate: updated SRCREV git

Signed-off-by: Stefano Babic <sbabic@denx.de>

recipes-support/swupdate/swupdate_git.bb

@@ -3,4 +3,4 @@ require swupdate_tools.inc
 
 DEFAULT_PREFERENCE = "-1"
 
-SRCREV ?= '8a2ff356c3d93bb4f681a511e6b42ed64dcf6409'
+SRCREV ?= 'bc641328271e0d94c5076ebbc97f4af8aa2467bf'