[IA64] Rename platform_name to ia64_platform_name

The macro name is too generic and conflicts with
snd_soc_dai_link.platform_name, which triggers lots of build errors.

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/arch/ia64/pci/fixup.c b/arch/ia64/pci/fixup.c
index f5959c0..eab28e3 100644
--- a/arch/ia64/pci/fixup.c
+++ b/arch/ia64/pci/fixup.c
@@ -30,8 +30,8 @@
 	struct pci_bus *bus;
 	u16 config;
 
-	if ((strcmp(platform_name, "dig") != 0)
-	    && (strcmp(platform_name, "hpzx1")  != 0))
+	if ((strcmp(ia64_platform_name, "dig") != 0)
+	    && (strcmp(ia64_platform_name, "hpzx1")  != 0))
 		return;
 	/* Maybe, this machine supports legacy memory map. */