hwc: enforce bandwidth limitations on each memory interface

The memory bandwidth is divided between two interfaces.  Check this
after making an allocation, since it's tricky to account for during
allocation (anything involving the framebuffer can completely change the
bandwidth on each interface).

Change-Id: I17a4bc079fc24d924c3a1c2c651d1e544ebc4325
Signed-off-by: Greg Hackmann <ghackmann@google.com>
1 file changed