ANDROID: Removed default m for virtual sw crypto device

Goldfish and Cuttlefish already use software encrytion drivers and
don't use this one.

Bug: 150620456
Test: Treehugger
Signed-off-by: Ram Muthiah <rammuthiah@google.com>
Change-Id: I72b0155b5db9bc54bfca0ed99734b7c2c513ceac