radv: move shaders related code to radv_shader.c

Reduce size of radv_pipeline.c and improve code isolation. More
code can probably moved but it's a start.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/vulkan/si_cmd_buffer.c

@@ -28,6 +28,7 @@
 /* command buffer handling for SI */
 
 #include "radv_private.h"
+#include "radv_shader.h"
 #include "radv_cs.h"
 #include "sid.h"
 #include "gfx9d.h"