coverity: Improve coverage using CM3_SYSTEM_RESET build flag for a3700

Recent patch from Marvell added a build option CM3_SYSTEM_RESET which
leverages a new source file:
plat/marvell/armada/a3k/common/cm3_system_reset.c

This patch add this new build option to coverity makefile command to
analyze this file thereby improving file coverage.

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: Ia8954b5793a8ff28676e6edf21b937a3926dc3e1
1 file changed