dt-bindings: pinctrl: msm8226: Add General Purpose clocks

Document the general purpose clock functions that are found on MSM8226.

Signed-off-by: Matti Lehtimäki <matti.lehtimaki@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230106114403.275865-2-matti.lehtimaki@gmail.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>