Fix configure warnings in defconfigs for netX and Picotux 200

Since May 8 2007 the symbols RTC_INTF_PROC, RTC_INTF_SYSFS and
RTC_INTF_DEV are not tristate anymore.  This fixes the following
warnings:

arch/arm/configs/picotux200_defconfig:1072:warning: symbol value 'm' invalid for RTC_INTF_SYSFS
arch/arm/configs/picotux200_defconfig:1073:warning: symbol value 'm' invalid for RTC_INTF_PROC
arch/arm/configs/picotux200_defconfig:1074:warning: symbol value 'm' invalid for RTC_INTF_DEV

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Robert Schwebel <r.schwebel@pengutronix.de>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Simon Richter <Simon.Richter@kleinhenz.com>
Cc: Andrew Victor <linux@maxim.org.za>