omap3: Unify omap2_set_globals_3[43,6x]x functions

The only difference between them is the physical address of the
uart4 port, which is only present in 36xx chips.

We don't really need to care about keeping these 2 functions, since
the decision to use uart4 is more cleanly done later when we do have
access to omap_revision variable.

Signed-off-by: Sergio Aguirre <saaguirre@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
[tony@atomide.com: added comment for the uart4_phys]
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-rx51.c

@@ -143,7 +143,7 @@ static void __init rx51_init(void)
 
 static void __init rx51_map_io(void)
 {
-	omap2_set_globals_343x();
+	omap2_set_globals_3xxx();
 	rx51_video_mem_init();
 	omap34xx_map_common_io();
 }