css(sgi): switch to SCP/MCP 2.8.0 release binaries

This patch changes usage of SCP binaries for
 rdn1edge
 rdn1edgex2
 rdv1
 sgi-575

platforms from 2.8.0-dev to 2.8.0 release.

All binaries are stored in corresponding subfolders
in common css_scp_2.8.0 folder.

Change-Id: Ib3c294cf308ba109632586aab837c033be1dee9b
Signed-off-by: Zelalem Aweke <zelalem.aweke@arm.com>
diff --git a/rdv1_utils.sh b/rdv1_utils.sh
index 69fedc8..549e7e3 100644
--- a/rdv1_utils.sh
+++ b/rdv1_utils.sh
@@ -9,7 +9,9 @@
 
 sgi_prebuilts="${sgi_prebuilts:-$css_downloads/sgi/rdv1}"
 
-scp_mcp_prebuilts="$sgi_prebuilts"
+# Pre-built SCP/MCP v2.8.0 release binaries
+scp_mcp_prebuilts="${scp_mcp_prebuilts:-$css_downloads_280/sgi/rdv1}"
+
 
 fvp_kernels[fvp-sgi-busybox]="$sgi_prebuilts/Image"
 fvp_initrd_urls[fvp-sgi-ramdisk]="$sgi_prebuilts/ramdisk-busybox.img"