android: radv: fix necessary dependecies

Fixes building errors due to libmesa_util and libexpat dependencies:

In file included from external/mesa/src/amd/vulkan/radv_device.c:52:
external/mesa/src/util/xmlpool.h:115:10: fatal error: 'xmlpool/options.h' file not found
         ^~~~~~~~~~~~~~~~~~~
1 error generated.

FAILED: out/target/product/x86_64/obj_x86/SHARED_LIBRARIES/vulkan.radv_intermediates/LINKED/vulkan.radv.so
...
external/mesa/src/util/xmlconfig.c:670: error: undefined reference to 'XML_ParserCreate'
...
clang.real: error: linker command failed with exit code 1 (use -v to see invocation)

Fixes: 3c2e826 ("radv: Add support for driconf.")
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>