wifi: Change namespace

Move the implementation to "android::hardware::wifi:V1_0::implementation"
namespace.
This is following the style guidelines in NFC HIDL
implementation(go/aog/279421).

While there,
Run checkstyle to correct formatting issues.

Bug:31936700
Test: mmma -j32 hardware/interfaces/wifi/1.0/default
Change-Id: I5600a60a0041b3318ed9289823ec335a8ed8a83d