firmware-utils: bump to git HEAD

  706e9cc tplink-safeloader: support for Archer A6 v3 JP
  497726b firmware-utils: support checksum for AVM fritzbox wasp SOCs
  2ca6462 iptime-crc32: add support for AX8004M
  57d0e31 tplink-safeloader: TP-Link EAP615-Wall v1 support
  8a8da19 tplink-safeloader: add TL-WPA8631P v3 support
  eea4ee7 tplink-safeloader: add TP-Link Archer A9 v6 support

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>