Adds a sunxi-cedrus-drv-video libVA backend

This VA backend uses v4l2's Frame API proposal to interface with the
"sunxi-cedrus" video driver on Allwinner SoC. Only a few parts of the
code are really dependent on sunxi-cedrus and this VA backend could be
reused for other v4l drivers using the Frame API.

.gitignore

@@ -0,0 +1,45 @@
+# Object files
+*.o
+*.ko
+
+# Libraries
+*.lib
+*.a
+*.lo
+*.la
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Misc
+*~
+*.orig
+*.rej
+*.loT
+*.bin
+*.pc
+*.g[4-7]s
+.deps
+.libs
+install-sh
+libtool
+ltmain.sh
+compile
+missing
+Makefile
+Makefile.in
+config.h
+config.h.in
+stamp-h1
+aclocal.m4
+autom4te.cache
+config.guess
+config.log
+config.status
+config.sub
+configure
+depcomp
+TAGS