SamsungQualcommRIL: make mQANElements adjustable

The new proprietary blobs for i9305 require that mQANElements = 6.
This simply introduces a new property that can be used to adjust
the value of mQANElements if required.

Change-Id: If25fd73fd2700d6d36b2f2e8bd671b56703b0878
merge changes from Omni 4.4 into local branch