User Guide: Enable secure memory on Foundation FVP

Previously, the User Guide recommended launching the Foundation
FVP with the parameter --no-secure-memory, which disabled security
control of the address map. This was due to missing support for
secure memory regions in v1 of the Foundation FVP. This is no longer
needed as secure memory is now supported on the Foundation FVP.

This patch updates the User Guide to recommend enabling secure
memory instead.

Change-Id: Ifae53c10ff6e1c7c6724af20e05a3d3a88f6a5ad

docs/user-guide.md

@@ -697,7 +697,7 @@ Trusted Firmware" section above).
 
     <path-to>/Foundation_v8                   \
     --cores=4                                 \
-    --no-secure-memory                        \
+    --secure-memory                           \
     --visualization                           \
     --gicv3                                   \
     --data="<path-to>/<bl1-binary>"@0x0       \
@@ -900,7 +900,7 @@ legacy VE memory map:
 
     <path-to>/Foundation_v8                   \
     --cores=4                                 \
-    --no-secure-memory                        \
+    --secure-memory                           \
     --visualization                           \
     --no-gicv3                                \
     --data="<path-to>/<bl1-binary>"@0x0       \