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/arch/powerpc/cpu/mpc85xx/Kconfig b/arch/powerpc/cpu/mpc85xx/Kconfig
index e7003d3..f4f5ebf 100644
--- a/arch/powerpc/cpu/mpc85xx/Kconfig
+++ b/arch/powerpc/cpu/mpc85xx/Kconfig
@@ -1216,6 +1216,10 @@
 config ENABLE_36BIT_PHYS
 	bool "Enable 36bit physical address space support"
 
+config SYS_BOOK3E_HV
+	bool "Category E.HV is supported"
+	depends on BOOKE
+
 config SYS_MPC85XX_NO_RESETVEC
 	bool "Discard resetvec section and move bootpg section up"
 	depends on MPC85xx