build: Define build option for hardware-assisted coherency
The boolean build option HW_ASSISTED_COHERENCY is introduced to enable
various optimizations in ARM Trusted Software, when built for such
systems. It's set to 0 by default.

Change-Id: I638390da6e1718fe024dcf5b402e07084f1eb014
Signed-off-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
1 parent 56036ed commit 3c251af392f2dfeedfe9c4595a8a33188c1d1d14
@Jeenu Viswambharan Jeenu Viswambharan authored on 4 Jan 2017
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make_helpers/defaults.mk