ARM: OMAP2+: Remove unused legacy code for n8x0

We are now booting all mach-omap2 in device tree only mode.
Any code that is only called in legacy boot mode where
of_have_populated_dt() is not set is safe to remove now.
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
[tony@atomide.com: left out probe changes to avoid merge conflict]
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-n8x0.c

@@ -53,14 +53,12 @@ static u32 board_caps;
 
 static void board_check_revision(void)
 {
-	if (of_have_populated_dt()) {
-		if (of_machine_is_compatible("nokia,n800"))
-			board_caps = NOKIA_N800;
-		else if (of_machine_is_compatible("nokia,n810"))
-			board_caps = NOKIA_N810;
-		else if (of_machine_is_compatible("nokia,n810-wimax"))
-			board_caps = NOKIA_N810_WIMAX;
-	}
+	if (of_machine_is_compatible("nokia,n800"))
+		board_caps = NOKIA_N800;
+	else if (of_machine_is_compatible("nokia,n810"))
+		board_caps = NOKIA_N810;
+	else if (of_machine_is_compatible("nokia,n810-wimax"))
+		board_caps = NOKIA_N810_WIMAX;
 
 	if (!board_caps)
 		pr_err("Unknown board\n");