Specify the PDC mapping for SM8250, so that gpio interrupts are
propertly mapped to the wakeup IRQs of the PDC.

Fixes: 4e3ec9e4 ("pinctrl: qcom: Add sm8250 pinctrl driver.")
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20201028043642.1141723-1-bjorn.andersson@linaro.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>