SPM: Rename SPM_DEPRECATED flag to SPM_MM

The SPM implementation based on MM is going to be kept for the
foreseeable future.

Change-Id: I11e96778a4f52a1aa803e7e048d9a7cb24a53954
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
Acked-by: Sumit Garg <sumit.garg@linaro.org>
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index a8ac286..9ad7bd7 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -240,7 +240,7 @@
 endif
 
 # SPM uses libfdt in Arm platforms
-ifeq (${SPM_DEPRECATED},0)
+ifeq (${SPM_MM},0)
 ifeq (${ENABLE_SPM},1)
 BL31_SOURCES		+=	common/fdt_wrappers.c			\
 				plat/common/plat_spm_rd.c		\