Fix memory leak in WifiLegacyHal.

`WifiLegacyHal::getSupportedRadioCombinationsMatrix()`
allocs a buffer and returns it to
`WifiChip::getSupportedRadioCombinationsInternal()`, but
`WifiChip::getSupportedRadioCombinationsInternal()` never frees it.

Bug: 287883356
Test: manually test
Change-Id: I0e9d529e93cbb5fe254d48947661a2ae3d99d763
1 file changed