connman: upgrade to 1.28

- Fixes an issue with DHCPv6 retransmission timer
calculation that causes system load to jump to 100%;
- All WiFi P2P issues encountered with Miracast have been addressed;
- ConnMan no longer hands off foreground autoscanning to
wpa_supplicant as it causes issues when finding hidden WiFi networks;

Other changes and fixes include:

- Several fixes for handling IPv6 contexts via oFono;
- Fix memory deallocation in exit code paths;
- Use OPEN auth_alg for wpa_supplicant open WiFi networks;
- A WiFi Access Point with unknown strength now has a proper
minimum value which translates to a service 'Strenght' property of 30;
- Fix byte order in DHCP server identifier;
- Properly cancel an ongoing service connect if the Agent exits.

(From OE-Core rev: fa718d0d2d74893bf8e532a132f8ede26552d2be)

Signed-off-by: Cristian Iorga <cristian.iorga@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-connectivity/connman/connman_1.28.bb

@@ -5,9 +5,8 @@ SRC_URI  = "${KERNELORG_MIRROR}/linux/network/${BPN}/${BP}.tar.xz \
             file://add_xuser_dbus_permission.patch \
             file://connman \
             "
-SRC_URI[md5sum] = "ba05b110b7c81e5fa14e8b402ef37a9e"
-SRC_URI[sha256sum] = "7184e4b6d954449ee00a30e188924b3e37a20ad2fd9a0b76a2bdd82c863dcf8a"
+SRC_URI[md5sum] = "6e07c93877f80bb73c9d4dbfc697f3fc"
+SRC_URI[sha256sum] = "b1d5e7dd2652725906e220a8b0206477e97080e835272971e3b2fd10943c5c94"
 
 RRECOMMENDS_${PN} = "connman-conf"
 
-PR = "r1"