Convert CONFIG_ENABLE_36BIT_PHYS to Kconfig

This converts the following to Kconfig:
   CONFIG_ENABLE_36BIT_PHYS

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/P1010RDB-PA_NOR_defconfig b/configs/P1010RDB-PA_NOR_defconfig
index 681af51..6770981 100644
--- a/configs/P1010RDB-PA_NOR_defconfig
+++ b/configs/P1010RDB-PA_NOR_defconfig
@@ -8,6 +8,7 @@
 CONFIG_MPC85xx=y
 CONFIG_TARGET_P1010RDB_PA=y
 CONFIG_MPC85XX_HAVE_RESET_VECTOR=y
+CONFIG_ENABLE_36BIT_PHYS=y
 CONFIG_SYS_MPC85XX_NO_RESETVEC=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y