test(spmc): add flag to run tests with asserts disabled

Add a flag to build and run the test_spmc tests with assertions
disabled in addition to the asserts enabled run. This flag is set
to true by default.

Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
Change-Id: I3cf233af467fe61dbbf5ded341fd223470255d2b
1 file changed