ANDROID: virt_wifi: fix export symbol types

In commit 39bb6b4242ff ("ANDROID: virt_wifi: Add data ops for scan data
simulation") some new symbols were exported, but they should have been
set as _GPL symbols.

Fix this up by properly.

Bug: 139421123
Cc: lesl <lesl@google.com>
Cc: Alistair Delva <adelva@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ied186f08c695f5d1f50d88446f1e71fef303e7f8