Remove unused method tryGetWifiInfoForVcn

Remove hidden API usages backed by VCN since they will
not be accessible anymore when VCN is moved to mainline.

Bug: 369710077
Test: presubmit
Flag: EXEMPT remove unused code
Change-Id: I9020e6f647795cfa6fd64f32a2c6f1eda2d93a1b
1 file changed