sunxi: Fix UART console index for A33-OLinuXino

sunxi: Fix UART console index for A33-OLinuXino

The A33-OLinuXino defconfig was using the default CONS_INDEX value for
A33, which actually points to the R_UART, which is routed to the GPIO
header without proper pull-ups or diodes. The board has a separate
header for UART0, which are routed to pins PB0 and PB1. This header
is properly marked and is likely the first pins any user would try
to get a console.

Fix CONS_INDEX in the defconfig so the console appears on UART0.

Fixes: ca5c37026be4 ("sunxi: Add support for A33-OLinuXino board")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>