am335x_evm: Fix CONS_INDEX numbering

Commit f6d1f6e4a58edae4776937647381a43fea5e83a5 broke selection of UARTs
other than UART0 for am335x_evm configurations by setting CONS_INDEX to
1 for all configurations.  Revert the CONS_INDEX changes.

Signed-off-by: Andrew Bradford <andrew@bradfordembedded.com>
1 file changed