Avoid cpu_physical_memory_rw() with a constant is_write argument

This commit was produced with the included Coccinelle script
scripts/coccinelle/exec_rw_const.

Inspired-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
diff --git a/hw/xen/xen_pt_graphics.c b/hw/xen/xen_pt_graphics.c
index b11e4e0..a3bc7e3 100644
--- a/hw/xen/xen_pt_graphics.c
+++ b/hw/xen/xen_pt_graphics.c
@@ -222,7 +222,7 @@
     }
 
     /* Currently we fixed this address as a primary for legacy BIOS. */
-    cpu_physical_memory_rw(0xc0000, bios, bios_size, true);
+    cpu_physical_memory_write(0xc0000, bios, bios_size);
 }
 
 uint32_t igd_read_opregion(XenPCIPassthroughState *s)