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Compiling BL31 for the Rockchip platform now produces a message about
the deprecation of gic_common.c.
Follow the advice and use include gicv2.mk instead.
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Change-Id: I396b977d57975dba27cfed801ad5264bbbde2b5e