pinctrl: qcom: qdf2xxx: add names to the gpios

The sysfs and debugfs entries for pin control drivers work better when
the individual pins are given real names, even if they are all just
"gpio0", "gpio1", etc.

Signed-off-by: Timur Tabi <timur@codeaurora.org>
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>