build-acs: adapt to changes in acs v19.01_REL2.1
There are changes to the location of the ACS build script in ACS
v19.01_REL2.1 release. Adapt the build-acs script to adapt to
these changes.
Change-Id: I7efbc0fc2d2229625a3a0b52105d5e9b6c5687ef
Signed-off-by:
Thomas Abraham <thomas.abraham@arm.com>
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