v3d/limits: add line width and point size limits

They will be the same for the OpenGL and Vulkan driver, so let's put
it on the commit limits header.

Part-of: <!6766>

src/broadcom/common/v3d_limits.h

@@ -59,4 +59,7 @@
 
 #define V3D_MAX_DRAW_BUFFERS 4
 
+#define V3D_MAX_POINT_SIZE 512.0f
+#define V3D_MAX_LINE_WIDTH 32
+
 #endif /* V3D_LIMITS_H */

src/gallium/drivers/v3d/v3d_screen.c

@@ -25,6 +25,7 @@
 #include <sys/sysinfo.h>
 
 #include "common/v3d_device_info.h"
+#include "common/v3d_limits.h"
 #include "util/os_misc.h"
 #include "pipe/p_defines.h"
 #include "pipe/p_screen.h"
@@ -279,11 +280,11 @@ v3d_screen_get_paramf(struct pipe_screen *pscreen, enum pipe_capf param)
         switch (param) {
         case PIPE_CAPF_MAX_LINE_WIDTH:
         case PIPE_CAPF_MAX_LINE_WIDTH_AA:
-                return 32;
+                return V3D_MAX_LINE_WIDTH;
 
         case PIPE_CAPF_MAX_POINT_WIDTH:
         case PIPE_CAPF_MAX_POINT_WIDTH_AA:
-                return 512.0f;
+                return V3D_MAX_POINT_SIZE;
 
         case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
                 return 0.0f;