scp: scp is now built using cmake

The scp is now built using cmake, specifically with Makefile.cmake. This
requires changes to configuration as how the compiler is specified has
changed. This also required changes to any reference to scp files as
these have all moved.

Signed-off-by: Joel Goddard <joel.goddard@arm.com>
Signed-off-by: Leandro Belli <leandro.belli@arm.com>
Signed-off-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
Co-authored-by: Nicola Mazzucato <nicola.mazzucato@arm.com>
Change-Id: Idaab98e8f217b891e3dd76791502bc5988e39ec4
12 files changed