gpio: Error pin out of range consistently.

Several GPIO drivers detect an out of range pin number and return an
errno error code.  Use the same errno code across all drivers.

Change-Id: I0e2949432d6845d12c37064c78f9c228b8e8e45a
Signed-off-by: Marcus Shawcroft <marcus.shawcroft@arm.com>
1 file changed