qcom-common: switch to CM12 rebased libril

Thanks Giulio!
https://github.com/CyanogenMod/android_device_sony_qcom-common/commit/5211bdba38c1f10a2880e16cdc272cb664fe491e
https://github.com/CyanogenMod/android_device_sony_qcom-common/commit/b4f74393245014a91f2e0ce55762aaf38fc9408e
https://github.com/CyanogenMod/android_device_sony_qcom-common/commit/725ccb2748f9b2a4f4b3371dee6c3c44eca3dc65

Change-Id: I16b4c50dc75df1baf97b165364f1870e5b0dc95a