fix(plat/arm/sgi): disable SVE for NS to support SPM_MM builds

Commit 4333f95 ("fix(spm_mm): do not compile if SVE/SME is enabled")
introduced a comiple time check to verify if ENABLE_SVE_FOR_NS is set to
0 when SPM_MM build is enabled. To support SPM_MM builds on SGI/RD
platforms set ENABLE_SVE_FOR_NS to 0.

Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
Change-Id: If78ed7567f6d988795b2bc7f772a883783246964
diff --git a/plat/arm/css/sgi/sgi-common.mk b/plat/arm/css/sgi/sgi-common.mk
index 8baf4ee..f56fe35 100644
--- a/plat/arm/css/sgi/sgi-common.mk
+++ b/plat/arm/css/sgi/sgi-common.mk
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2018-2020, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2018-2021, ARM Limited and Contributors. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -20,6 +20,9 @@
 
 CSS_SGI_PLATFORM_VARIANT	:=	0
 
+# Do not enable SVE
+ENABLE_SVE_FOR_NS		:=	0
+
 INTERCONNECT_SOURCES	:=	${CSS_ENT_BASE}/sgi_interconnect.c
 
 PLAT_INCLUDES		+=	-I${CSS_ENT_BASE}/include