xtensa: rename prom_update_property to of_update_property

This rename happened in 79d1c71 powerpc+of: Rename the drivers/of prom_*
functions to of_*.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
diff --git a/arch/xtensa/platforms/xtfpga/setup.c b/arch/xtensa/platforms/xtfpga/setup.c
index 4b9951a..9d888a2 100644
--- a/arch/xtensa/platforms/xtfpga/setup.c
+++ b/arch/xtensa/platforms/xtfpga/setup.c
@@ -100,7 +100,7 @@
 	}
 
 	*(u32 *)newfreq->value = cpu_to_be32(*(u32 *)XTFPGA_CLKFRQ_VADDR);
-	prom_update_property(node, newfreq);
+	of_update_property(node, newfreq);
 }
 
 #define MAC_LEN 6
@@ -128,7 +128,7 @@
 
 	memcpy(newmac->value, macaddr, MAC_LEN);
 	((u8*)newmac->value)[5] = (*(u32*)DIP_SWITCHES_VADDR) & 0x3f;
-	prom_update_property(node, newmac);
+	of_update_property(node, newmac);
 }
 
 static int __init machine_setup(void)