of: add 'of_' prefix to machine_is_compatible()

machine is compatible is an OF-specific call.  It should have
the of_ prefix to protect the global namespace.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Michal Simek <monstr@monstr.eu>
diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index 5f1b580..e45ab8d 100644
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -2439,7 +2439,7 @@
 	 * The Apple iBook1 uses non-standard memory frequencies.
 	 * We detect it and set the frequency manually.
 	 */
-	if (machine_is_compatible("PowerBook2,1")) {
+	if (of_machine_is_compatible("PowerBook2,1")) {
 		par->pll_limits.mclk = 70;
 		par->pll_limits.xclk = 53;
 	}
@@ -2659,7 +2659,7 @@
 		      FBINFO_HWACCEL_YPAN;
 
 #ifdef CONFIG_PMAC_BACKLIGHT
-	if (M64_HAS(G3_PB_1_1) && machine_is_compatible("PowerBook1,1")) {
+	if (M64_HAS(G3_PB_1_1) && of_machine_is_compatible("PowerBook1,1")) {
 		/*
 		 * these bits let the 101 powerbook
 		 * wake up from sleep -- paulus
@@ -2690,9 +2690,9 @@
 				if (M64_HAS(G3_PB_1024x768))
 					/* G3 PowerBook with 1024x768 LCD */
 					default_vmode = VMODE_1024_768_60;
-				else if (machine_is_compatible("iMac"))
+				else if (of_machine_is_compatible("iMac"))
 					default_vmode = VMODE_1024_768_75;
-				else if (machine_is_compatible("PowerBook2,1"))
+				else if (of_machine_is_compatible("PowerBook2,1"))
 					/* iBook with 800x600 LCD */
 					default_vmode = VMODE_800_600_60;
 				else