gpiolib: Get rid of never false gpio_is_valid() calls

In the cases when gpio_is_valid() is called with unsigned parameter
the result is always true in the GPIO library code, hence the check
for false won't ever be true. Get rid of such calls.

While at it, move GPIO device base to be unsigned to clearly show
it won't ever be negative. This requires a new definition for the
maximum GPIO number in the system.

Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>

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