arm: TI AM335x fix gpio_pin numbers in lookup table.

gpio_pin are calculated as [GPIO_BANK]*32 + GPIO_PIN.
gpio_pin are wrong for these pins.
As a consequence wrong pins are acquired and used.

Approved by: manu (mentor)
Reported by: Martin Zakardissnehf
(martin.zakardissnehf@se.abb.com)
Differential revision: https://reviews.freebsd.org/D31164