Add country code check in SoftAp test

Skip the following testcases if telephony is not available
& if default country code is not programmed in system property.
testActiveCountryCodeChangedCallback
testSetGetSoftApConfigurationAndSoftApCapabilityCallback
testStartTetheredHotspotWithChannelConfigAndSoftApStateAndInfoCallback

The reason is, these tests require countrycode to be set in the framework.
And there are implementations which doesn't set the default country code
via system property in WiFi only devices.

Bug: 254476190
Test: atest android.net.wifi.cts.WifiManagerTest
Change-Id: I1682402144dd2f7d2dea225d21fa1ac5602f996c