Camera service skeleton

Skeleton that implements camera emulation service over QEMU pipe. More meat
will be added as the guest camera emulation develops.

This is a patch taken from approved AOSP commit that didn't go through
because of a merge conflict.

Change-Id: I6f0a2e42be4f5f0bd86d3dbf0c2a609e74b200c2
diff --git a/Makefile.common b/Makefile.common
index 0b9f954..ed3bd6e 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -424,7 +424,8 @@
     android/qemu-setup.c \
     android/snapshot.c \
     android/utils/timezone.c \
-    android/camera/camera-format-converters.c
+    android/camera/camera-format-converters.c \
+    android/camera/camera-service.c
 
 $(call gen-hw-config-defs)