fix(rmmd): avoid TRP when external RMM is defined

The Test Realm Package (TRP) is a small payload that runs at R-EL2 if an
external RMM image path is not provided. Currently, the TRP makefile is
included if RME is enabled, regardless of whether an external RMM
image path is defined or not. This fix ensures that TRP is included
only when an external RMM path is not defined.

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Change-Id: I3cc3d2a636e65071e45c5c82cc125290887ffc09
1 file changed