Upgrade to SWUpdate 2021.04

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

recipes-support/swupdate/swupdate_2021.04.bb

+require swupdate.inc
+
+SRCREV = "47a1246435fdb78fba15cc969596994130412956"
+
+LIC_FILES_CHKSUM = "file://LICENSES/GPL-2.0-only.txt;md5=4ee23c52855c222cba72583d301d2338 \
+                    file://LICENSES/LGPL-2.1-or-later.txt;md5=4fbd65380cdd255951079008b364516c \
+                    file://LICENSES/MIT.txt;md5=838c366f69b72c5df05c96dff79b35f2 \
+                    file://LICENSES/BSD-2-Clause.txt;md5=6a31f076f5773aabd8ff86191ad6fdd5 \
+                    file://LICENSES/BSD-3-Clause.txt;md5=4a1190eac56a9db675d58ebe86eaf50c \
+                    file://LICENSES/LicenseRef-OpenSSL-Exception.txt;md5=5f205fe7a7f2b056b4fa42603fe2d63a"

recipes-support/swupdate/swupdate_git.bb

@@ -2,8 +2,8 @@ require swupdate.inc
 
 DEFAULT_PREFERENCE = "-1"
 
-SRCREV ?= "fa7f5a19cab6e475ce4f51c02f74bd5be55cb5ba"
-PV = "2020.11+git${SRCPV}"
+SRCREV ?= "47a1246435fdb78fba15cc969596994130412956"
+PV = "2021.04+git${SRCPV}"
 
 LIC_FILES_CHKSUM = "file://LICENSES/GPL-2.0-only.txt;md5=4ee23c52855c222cba72583d301d2338 \
                     file://LICENSES/LGPL-2.1-or-later.txt;md5=4fbd65380cdd255951079008b364516c \