Becuase the board select menu in arch/arm/Kconfig is too big, move the OMAP3 board select menu to omap3/Kconfig.
Move also common settings (CONFIG_SYS_CPU="armv7" and CONFIG_SYS_SOC="omap3
Signed-off-by: Masahiro Yamada Reviewed-by: Tom Rini
CONFIG_ARM=y CONFIG_OMAP34XX=y CONFIG_TARGET_NOKIA_RX51=y
