gpio: aspeed: Remove dependence on GPIOF_* macros

gpio: aspeed: Remove dependence on GPIOF_* macros

3b3a324767f2c79b9cb600143cd93d236e990296 is a (v2) patch which had
unresolved review comments[1]. Address the comments by removing the use
of macros from the consumer header (this patch represents the diff
between v2 and v3[2]).

[1] https://lkml.org/lkml/2017/1/26/337
[2] https://lkml.org/lkml/2017/1/26/786

Fixes: 3b3a324767f2 ("gpio: aspeed: Add banks Y, Z, AA, AB and AC")
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>