gpu: ion: Add scm calls for content protection 2.0

The next generation of content protection has separate SCM
calls into TZ. Add these functions in a dedicated file so they
can be used by any Ion heap.

Change-Id: I197130f6a5fc33efcd6871b0f7c362fa99f18d20
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
diff --git a/drivers/gpu/ion/msm/Makefile b/drivers/gpu/ion/msm/Makefile
index bedd8d2..1893405 100644
--- a/drivers/gpu/ion/msm/Makefile
+++ b/drivers/gpu/ion/msm/Makefile
@@ -1 +1 @@
-obj-y += msm_ion.o
+obj-y += msm_ion.o ion_cp_common.o