NOT_VCN_MANAGED - do not use on Android R

Wifi module needs to be backwards compatible with
R. Referencing NOT_VCN_MANAGED in R causes a crash.
Thus, guard with SDK level check.

Bug: 179310016
Bug: 175662146
Test: postsubmit S-module-on-R-platform tests
Change-Id: I14be7fb2395100c1d9c2b2b518538af6d5d8c1fd
Merged-In: I14be7fb2395100c1d9c2b2b518538af6d5d8c1fd
2 files changed