Add getSupportedExtensions to NNAPI IDevice

Bug: 118603011
Test: mma
Change-Id: I5bd1cf2dfd8c4700819d52a87931df2959ef6929
Merged-In: I5bd1cf2dfd8c4700819d52a87931df2959ef6929
(cherry picked from commit 6148d0f446d331f9e76f3efe6554e3f2cb1907aa)
2 files changed