Convert CONFIG_SYS_BOOK3E_HV to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_BOOK3E_HV

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/kmcent2_defconfig b/configs/kmcent2_defconfig
index cd6fb96..38d33c2 100644
--- a/configs/kmcent2_defconfig
+++ b/configs/kmcent2_defconfig
@@ -11,6 +11,7 @@
 CONFIG_TARGET_KMCENT2=y
 CONFIG_MPC85XX_HAVE_RESET_VECTOR=y
 CONFIG_ENABLE_36BIT_PHYS=y
+CONFIG_SYS_BOOK3E_HV=y
 # CONFIG_DEEP_SLEEP is not set
 CONFIG_PCIE1=y
 CONFIG_KM_DEF_NETDEV="eth2"