nxp: Make board/freescale/common/Kconfig safe to include once in arch/Kconfig

The way that we use this file currently means that we have to guard it
in every platform Kconfig.  But it is also required in all NXP
platforms, including non-reference platforms.  Make all options in it
have appropriate dependencies so that we can include it a single time
under arch/Kconfig

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/pg_wcom_expu1_defconfig b/configs/pg_wcom_expu1_defconfig
index c5d6574..fe864c7 100644
--- a/configs/pg_wcom_expu1_defconfig
+++ b/configs/pg_wcom_expu1_defconfig
@@ -18,6 +18,7 @@
 CONFIG_SYS_LOAD_ADDR=0x82000000
 CONFIG_ENV_ADDR=0x60060000
 CONFIG_AHCI=y
+# CONFIG_DEEP_SLEEP is not set
 CONFIG_KM_DEF_NETDEV="eth2"
 CONFIG_KM_COMMON_ETH_INIT=y
 CONFIG_PIGGY_MAC_ADDRESS_OFFSET=3