python-smartpm: use md5 as the digest for rpm_sys channel

Use md5 sum instead of mtime as the "digest" method for rpm_sys channel.
The digest is used to determine if the channel has been updated. It was
found out that mtime was not a reliable digest. On some systems mtime
of the rpm db does not get updated after every transaction if transactions
(smart install / remove commands) are fired in quick succession. As a
consequence smartpm cache and rpm db get out of sync.

[YOCTO #10244]

(From OE-Core rev: e7267b4e78461e71a1175f93e2eb5e90272c2b47)

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python-smartpm_git.bb

@@ -26,6 +26,7 @@ SRC_URI = "\
           file://smart-locale.patch \
           file://smartpm-rpm5-support-check-signatures.patch \
           file://smart-add-deugging-when-targetpath-is-empty.patch \
+          file://channels-rpm_sys-use-md5sum-instead-of-mtime-as-the-.patch \
          "
 
 SRCREV = "407a7eca766431257dcd1da15175cc36a1bb22d0"