gpio: omap: remove wrong irq_domain_remove usage in probe

The bank->chip.irqdomain is uninitialized at the moment when
irq_domain_remove() is called, so remove this call.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>