fix(sve): disable ENABLE_SVE_FOR_NS for AARCH32

With patch [1], ENABLE_SVE_FOR_NS is always enable.
Disable it for AARCH32 platforms, as the feature is not supported.
The warning message is replaced with an error, and the second override
is removed.

[1] dc78e62d80e6 ("feat(sme): enable SME functionality")

Change-Id: Ic9c5e2612c9e00bd0d37ca3b59537e39270c9799
Signed-off-by: Yann Gautier <yann.gautier@st.com>
diff --git a/Makefile b/Makefile
index 32eb501..5630231 100644
--- a/Makefile
+++ b/Makefile
@@ -794,9 +794,7 @@
     endif
     ifeq (${ENABLE_SVE_FOR_NS},1)
         # Warning instead of error due to CI dependency on this
-        $(warning "ENABLE_SVE_FOR_NS cannot be used with ARCH=aarch32")
-        $(warning "Forced ENABLE_SVE_FOR_NS=0")
-        override ENABLE_SVE_FOR_NS	:= 0
+        $(error "ENABLE_SVE_FOR_NS cannot be used with ARCH=aarch32")
     endif
 endif