android: r600/sfn: fix includes and libmesa_nir dependency

android: r600/sfn: fix includes and libmesa_nir dependency

Fixes the following building errors:

In file included from external/mesa/src/gallium/drivers/r600/sfn/sfn_debug.cpp:28:
In file included from external/mesa/src/gallium/drivers/r600/sfn/sfn_debug.h:34:
In file included from external/mesa/src/compiler/nir/nir.h:41:
In file included from external/mesa/src/compiler/nir_types.h:36:
external/mesa/src/compiler/glsl_types.h:38:10: fatal error: 'main/config.h' file not found
#include "main/config.h"
         ^~~~~~~~~~~~~~~
1 error generated.

In file included from external/mesa/src/gallium/drivers/r600/sfn/sfn_debug.cpp:28:
In file included from external/mesa/src/gallium/drivers/r600/sfn/sfn_debug.h:34:
external/mesa/src/compiler/nir/nir.h:50:10: fatal error: 'nir_opcodes.h' file not found
#include "nir_opcodes.h"
         ^~~~~~~~~~~~~~~
1 error generated.

Fixes: f718ac62 ("r600/sfn: Add a basic nir shader backend")
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
Reviewed-by: Gert Wollny <gert.wollny@collabora.com>