selftests: xsk: Add xskxceiver.h dependency to Makefile

xskxceiver depends on xskxceiver.h so tell make about it.

Signed-off-by: Kal Conley <kal.conley@dectris.com>
Link: https://lore.kernel.org/r/20230403130151.31195-1-kal.conley@dectris.com


Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>