drm_hwcomposer: Connect ComposerClient with HwcDisplay

Implements the HWC3 frontend by calling the HWC2 interfaces already
exposed through DrmHwc, HwcDisplay, HwcLayer, and so on.

Convert between hwc2 types and hwc3 types in ComposerClient.

The following changes from !238 were used as a basis for this change,
and squashed together:
(drm_hwcomposer: Connect ComposerClient with HwcDisplay)
(drm_hwcomposer: Implement HWC3 frontend by calling down to HWC2)

The projects [1, 2] were used as a reference for the implementation.

[1]: https://android.googlesource.com/platform/hardware/google/graphics/common/+/refs/heads/main/hwc3/
[2]: https://android.googlesource.com/device/generic/goldfish-opengl/+/refs/heads/master/system/hwc3/

Co-authored-by: Normunds Rieksts <normunds.rieksts@arm.com>
Co-authored-by: Dennis Tsiang <dennis.tsiang@arm.com>
Change-Id: I98c10175d5c5f01aec1e192863238e16aa1537ec
Signed-off-by: Drew Davenport <ddavenport@chromium.org>
Signed-off-by: Drew Davenport <ddavenport@google.com>
diff --git a/hwc3/hwc3-drm.rc b/hwc3/hwc3-drm.rc
index ef22730..425dd24 100644
--- a/hwc3/hwc3-drm.rc
+++ b/hwc3/hwc3-drm.rc
@@ -1,5 +1,6 @@
 service vendor.hwcomposer-3 /vendor/bin/hw/android.hardware.composer.hwc3-service.drm
     class hal animation
+    interface aidl android.hardware.graphics.composer3.IComposer/default
     user system
     group graphics drmrpc
     capabilities SYS_NICE