configs: Remove CONFIG_NET_MULTI from board files

configs: Remove CONFIG_NET_MULTI from board files

CONFIG_NET_MULTI is not used anymore, so remove it from board files.

Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Kumar Gala <kumar.gala@freescale.com>
Cc: Sandeep Paulraj <s-paulraj@ti.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Tom Rini <trini@ti.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
Acked-by: Heiko Schocher <hs@denx.de>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Stefano Babic <sbabic@denx.de>
Tested-by: Marek Vasut <marek.vasut@gmail.com>
Tested-by: Heiko Schocher <hs@denx.de>