configs: move RTC_MV config from mv-plug-common.h to boards

To aid in migrating CONFIG_RTC_MV to Kconfig move the definition of it
from mv-plug-common.h to the board config headers that nest it.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
5 files changed