MIPS: Kconfig: Rename several firmware related config symbols.

With the upcoming merge of the ARC architecture there is a small likelyhood
of conflicting use for the CONFIG_ARC config symbol.  Rename it to
CONFIG_FW_ARC.  Also rename CONFIG_ARC32 to CONFIG_FW_ARC32, CONFIG_ARC64
to CONFIG_FW_ARC64.

For consistence also rename CONFIG_SNIPROM to CONFIG_FW_SNIPROM and
CONFIG_CFE to CONFIG_FW_CFE.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/sni/setup.c b/arch/mips/sni/setup.c
index 413f17f..d6c7bd4 100644
--- a/arch/mips/sni/setup.c
+++ b/arch/mips/sni/setup.c
@@ -15,12 +15,12 @@
 #include <linux/fb.h>
 #include <linux/screen_info.h>
 
-#ifdef CONFIG_ARC
+#ifdef CONFIG_FW_ARC
 #include <asm/fw/arc/types.h>
 #include <asm/sgialib.h>
 #endif
 
-#ifdef CONFIG_SNIPROM
+#ifdef CONFIG_FW_SNIPROM
 #include <asm/mipsprom.h>
 #endif
 
@@ -37,7 +37,7 @@
 
 static void __init sni_display_setup(void)
 {
-#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) && defined(CONFIG_ARC)
+#if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE) && defined(CONFIG_FW_ARC)
 	struct screen_info *si = &screen_info;
 	DISPLAY_STATUS *di;
 
@@ -56,7 +56,7 @@
 
 static void __init sni_console_setup(void)
 {
-#ifndef CONFIG_ARC
+#ifndef CONFIG_FW_ARC
 	char *ctype;
 	char *cdev;
 	char *baud;