Add new RIL commands to read/write and reset NV items.

Add new RIL commands to read/write and reset NV items.
Used by some operators for CDMA band config and PRL update.

Note that this CL depends on a typo fix in the corresponding
frameworks/base change and packages/services/Telephony depends
on a typo fix in this CL.

Bug: 12864208
Change-Id: I3081619a82af698a3197ce23870bf4de248fb3e7