imx31_phycore: Split the eet variant out into a different TARGET

Rename CONFIG_IMX31_PHYCORE_EET to CONFIG_TARGET_IMX31_PHYCORE_EET and
make this a distinct config target.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2554a2c..1f59679 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -315,7 +315,11 @@
 	select SUPPORT_SPL
 
 config TARGET_IMX31_PHYCORE
-	bool "Support imx31_phycore"
+	bool "Support imx31_phycore_eet"
+	select CPU_ARM1136
+
+config TARGET_IMX31_PHYCORE_EET
+	bool "Support imx31_phycore_eet"
 	select CPU_ARM1136
 
 config TARGET_MX31ADS