uboot-imx

board: ti: k2g: Make ddr3* declarations as static

All ddr3_emif declarations are not used outside ddr3_k2g.c
file. So make all of them as static.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>