gpio: davinci: Fix condition for irqchip registration

Since commit d29e741c ("gpio: davinci: drop platform data support"),
irqchip is no longer being registered on platforms what don't use
unbanked gpios. Fix this.

Reported-by: Sabeeh Khan <sabeeh-khan@ti.com>
Fixes: d29e741c ("gpio: davinci: drop platform data support")
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20241002071901.2752757-1-vigneshr@ti.com


Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>