[ARM] fix ixp2x00 defconfig NR_UARTS options

IXDP2[48]00 have only 1 UART on the board.

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2 files changed