pinctrl: qcom: msmfalcon: Split function groups based on mirrors

Split functions into groups corresponding to mirrorA and
mirrorB. This will help identify which function is selected.

Change-Id: Iefcb4a4b595ef0778e983a1902a5897cf292705f
Signed-off-by: Venkatesh Yadav Abbarapu <vabbar@codeaurora.org>