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/atari/atakeyb.c b/arch/m68k/atari/atakeyb.c
index a5f33c0..4add96d 100644
--- a/arch/m68k/atari/atakeyb.c
+++ b/arch/m68k/atari/atakeyb.c
@@ -609,10 +609,10 @@
 				 ACIA_RHTID : 0);
 
 	/* make sure the interrupt line is up */
-	} while ((mfp.par_dt_reg & 0x10) == 0);
+	} while ((st_mfp.par_dt_reg & 0x10) == 0);
 
 	/* enable ACIA Interrupts */
-	mfp.active_edge &= ~0x10;
+	st_mfp.active_edge &= ~0x10;
 	atari_turnon_irq(IRQ_MFP_ACIA);
 
 	ikbd_self_test = 1;