omap3: kconfig: move board select menu and common settings

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 <yamada.m@jp.panasonic.com>
Reviewed-by: Tom Rini <trini@ti.com>
diff --git a/configs/omap3_ha_defconfig b/configs/omap3_ha_defconfig
index a183fe7..50bffa9 100644
--- a/configs/omap3_ha_defconfig
+++ b/configs/omap3_ha_defconfig
@@ -1,4 +1,5 @@
 CONFIG_SPL=y
 CONFIG_SYS_EXTRA_OPTIONS="SYS_BOARD_OMAP3_HA"
 +S:CONFIG_ARM=y
++S:CONFIG_OMAP34XX=y
 +S:CONFIG_TARGET_TAO3530=y