TX and RX channel numbers programmed as '1' during EMAC
teardown initialization is wrong. This patch fixes the
same by setting channel number to '0' which is used by U-boot.

Signed-off-by: Sugumar Natarajan <sugumar@ti.com>
Signed-off-by: Nagabhushana Netagunte <nagabhushana.netagunte@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>