fbtft: Drop useless #ifdef CONFIG_OF and dead code

First of all there is no need to guard GPIO request by CONFIG_OF.
It works for everybody independently on resource provider. While here,
rename the function to reflect the above.

Moreover, since we have a global dependency to OF, the rest of
conditional compilation is no-op, i.e. it's always be true.

Due to above drop useless #ifdef CONFIG_OF and therefore dead code.

Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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