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>
6 files changed