default.xml: update to YP 3.1.5
Update poky to the tagged yocto-3.1.5 revision, and also uprev the
meta-openembedded, meta-python2, meta-virtualization, and
meta-iot-cloud layers to their latest dunfell revisions to pick up
fixes. Additionally, meta-raspberrypi has been updated to match the
revision being used with 3.1.5 in master/koi. Updates to community
supported hardware BSP layers will be addressed separately at a
later time.
Bug-AGL: SPEC-3793
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I02c4304a16125c7a01a0de9a37e536db2bd26e91