Flipping NR signal strengths coming from HAL

The documentation of NrSignalStrength states that some
of the cell signal strength values should be flipped when
taken in from the HAL (this matches what LTE does.)  The
current implementation did not match this behavior, this
change fixes that.

Bug: 144667130
Test: FrameworkTests, RILTest
Change-Id: I086cf6188b7948fa24715c2b2f7a03ba34d0cbd3
Merged-In: I086cf6188b7948fa24715c2b2f7a03ba34d0cbd3