m68k: atari - Rename "mfp" to "st_mfp"

http://kisskb.ellerman.id.au/kisskb/buildresult/72115/:
| net/mac80211/ieee80211_i.h:327: error: syntax error before 'volatile'
| net/mac80211/ieee80211_i.h:350: error: syntax error before '}' token
| net/mac80211/ieee80211_i.h:455: error: field 'sta' has incomplete type
| distcc[19430] ERROR: compile net/mac80211/main.c on sprygo/32 failed

This is caused by

| # define mfp ((*(volatile struct MFP*)MFP_BAS))

in arch/m68k/include/asm/atarihw.h, which conflicts with the new "mfp" enum in
net/mac80211/ieee80211_i.h.

Rename "mfp" to "st_mfp", as it's a way too generic name for a global #define.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/m68k/include/asm/atarihw.h b/arch/m68k/include/asm/atarihw.h
index 1412b4a..a714e1a 100644
--- a/arch/m68k/include/asm/atarihw.h
+++ b/arch/m68k/include/asm/atarihw.h
@@ -113,7 +113,7 @@
  * of nops on various machines. Somebody claimed that the tstb takes 600 ns.
  */
 #define	MFPDELAY() \
-	__asm__ __volatile__ ( "tstb %0" : : "m" (mfp.par_dt_reg) : "cc" );
+	__asm__ __volatile__ ( "tstb %0" : : "m" (st_mfp.par_dt_reg) : "cc" );
 
 /* Do cache push/invalidate for DMA read/write. This function obeys the
  * snooping on some machines (Medusa) and processors: The Medusa itself can
@@ -565,7 +565,7 @@
   u_char char_dummy23;
   u_char usart_dta;
  };
-# define mfp ((*(volatile struct MFP*)MFP_BAS))
+# define st_mfp ((*(volatile struct MFP*)MFP_BAS))
 
 /* TT's second MFP */