Update the SMS sending limit instantly (1/2)

Patch Set 2: observe the setting value instead of checking its value
every time

Patch Set 3: readd accidentally removed final modifier

Patch Set 4: remove redundant inner context variable

Change-Id: If8a0867945cf308391009eae168bf05a6dd429eb
Qualcomm LTE RILs: do not make mLteRsrp negative

  * In CM10.1, SignalStrength::validateInput() was added. This function expects
    mLteRsrp to be positive coming from the RIL.
  * Inverting in the RIL was causing validateInput() to flag mLteRsrp as invalid.
  * This shows up as a 0x7fffffff in About phone->Status->Signal strength when on LTE
  * Let validateInput() invert the sign instead of doing it in the custom RILs

Change-Id: I6ae7e4a56141c49628576305d21bee77b2a93ad7
Merge "Update the SMS sending limit instantly (1/2)" into cm-10.1
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_frameworks_opt_telephony into cm-10.1