[ARM][NFC] Tidy up subtarget frame pointer routines
getFramePointerReg only depends on information in ARMSubtarget, so move it in there so it can be accessed from more places. Make use of ARMSubtarget::getFramePointerReg to remove duplicated code. The main use of useR7AsFramePointer is getFramePointerReg, so inline it. Differential Revision: https://reviews.llvm.org/D104476
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