pinctrl: qcom: Update lahaina_groups for gpio6

As per the latest ipcat gpio6 func2 should be
mapped to qup6. Changes are done to support the same.

Change-Id: I57bf30916a8b51eececdeefe21ac3729bc20d903
Signed-off-by: Swetha Chikkaboraiah <schikk@codeaurora.org>