pinctrl: a3700: Fix the issue that gpio controller is registered with wrong node id

pinctrl: a3700: Fix the issue that gpio controller is registered with wrong node id

In armada_37xx_gpiochip_register, the return value of fdtdec_get_bool
should be true when gpio-controller is found; current codes makes a
wrong inverse return value judgement, this patch fixes it.

Signed-off-by: Ken Ma <[email protected]>
Cc: Stefan Roese <[email protected]>
Cc: Kostya Porotchkin <[email protected]>
Cc: Gregory CLEMENT <[email protected]>
Cc: Nadav Haklai <[email protected]>
Cc: Wilson Ding <[email protected]>
Reviewed-by: Stefan Roese <[email protected]>
Signed-off-by: Stefan Roese <[email protected]>