uboot-imx

Davinci: ea20: use gpio framework to access gpios

Drop direct access to SOC's registers and use
the function of the GPIO driver for da8xx.

[Tom: Remove gpio[68]_base as it's now unused]

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Bastian Ruppert <Bastian.Ruppert@Sewerin.de>
CC: dzu@denx.de
CC: Sandeep Paulraj <s-paulraj@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>