NFC: vts: Update VTS driver files as per HAL changes

The return types for the NFC HAL have changed, this patches updates the
VTS driver files.

Test: Test Passes
Bug: 32748647
Change-Id: Ic31d25c3d6b4a1db05e2e481a948a7547b30f2d7
Singed-off-by: Ruchi Kandoi <kandoiruchi@google.com>