SamsungExynos4RIL: fix emergency dialing

Change-Id: Ib910b82141a737b85b6c4e6cc7cec7c72a1d08b3
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 remote branch 'cyan/cm-10.1' into mr1-staging