swupdate: bump git srcrev
This includes the following changes:
a8d4538 bootloader transaction marker: allow to disable globally via cmdline
c3ef374 Change license for Logo
e06c7d9 lua: export swupdate_progress_update
4f41d74 parser: allow skip for bootenv
6144c27 Stream the SWU in a file chosen in sw-description
c533766 parser: added output attribute
3947e88 util: add macro to align a buffer
a49c1d9 cpio: export get_cpiohdr function
c704549 Add tests for the TLS code
edd5691 bootloader: fix typo
911bf46 Add cpp guards in IPC interface
d9a61e9 doc: fix WARNING: Title underline too short.
07bebd9 parser: support hook for bootloader entries
685ea77 doc: update talks list with LinuxLab 2018
Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>