add access to nvmem functions to enable firmware update

Fork of cc3000_hostdriver_mbedsocket by Martin Kojtal

Revision:
26:456f73ed2a75
Parent:
23:fed7f64dd520
Parent:
20:30b6ed7bf8fd
Child:
32:e62d7252401e
diff -r 4d4072a9cc12 -r 456f73ed2a75 cc3000.cpp