svga: remove SVGA_RELOC_READ flag in SVGA3D_BindGBSurface()

This fixes a rendering issue where UBO updates aren't always picked
up by drawing calls.  This issue effected the Webots robotics
simulator.  VMware bug 2175527.

Testing Done: Webots replay, piglit, misc Linux games

Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>

src/gallium/drivers/svga/svga_cmd.c

@@ -1693,7 +1693,7 @@ SVGA3D_BindGBSurface(struct svga_winsys_context *swc,
       return PIPE_ERROR_OUT_OF_MEMORY;
 
    swc->surface_relocation(swc, &cmd->sid, &cmd->mobid, surface,
-                           SVGA_RELOC_READ | SVGA_RELOC_INTERNAL);
+                           SVGA_RELOC_READ);
 
    swc->commit(swc);