Add yuyanghuang@ to OWNERS_core_networking_xts for APF firmware tests

This commit adds yuyanghuang@ to the OWNERS_core_networking_xts file,
specifically for APF firmware tests that verify the correct behavior of
the Wi-Fi APF interpreter.

Test: TH
Change-Id: Ifa0243f342a7844bd06f0e42ba09f16e3bf34058
1 file changed