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With the removal of fvp-base-arm32, we no longer have test coverage for
the external Arm toolchain.  Add this to qemuarm-secureboot CI so that
there is coverage again.  Note: it must be a 32bit machine, since there
are currently no aarch64 host toolchains for aarch64
Signed-off-by: Jon Mason <jon.mason@arm.com>