Call WifiCountryCode#set/clearOverrideCountryCode from shell cmd

Upon receiving adb shell command force-country-code,
call WifiCountryCode methods setOverrideCountryCode() and clearOverrideCountryCode()
directly instead of going through WifiServiceImpl.

Bug: 179944290
Test: cmd wifi force-country-code enabled JP
Test: cmd wifi force-country-code disabled
Change-Id: I7c5d9908c52316a49538ac643140a8286bf62e3b
1 file changed