ipq-wifi: add Yuncore AX850

ipq-wifi: add Yuncore AX850

It seems that adding Yuncore AX850 was missed during the board support,
and this breaks buildbots for ipq50xx with:
ERROR: unable to select packages:
  ipq-wifi-yuncore_ax850 (no such package):
    required by: world[ipq-wifi-yuncore_ax850]
make[4]: *** [/builder/shared-workdir/build/include/image.mk:396: target-dir-90b51871] Error 1
make[4]: *** Waiting for unfinished jobs....

So, add the required meta package.

Fixes: 5d2994a73e20 ("qualcommax: ipq50xx: Add support for Yuncore AX850")
Signed-off-by: Robert Marko <[email protected]>