Blackfin: dpmc: bind to MMR names and not CPUs

Have the code work off of MMR names rather than CPU defines so there is
less code to tweak in the future with new parts.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/mach-common/dpmc_modes.S

@@ -238,18 +238,17 @@ ENTRY(_unset_dram_srfs)
 ENDPROC(_unset_dram_srfs)
 
 ENTRY(_set_sic_iwr)
-#if defined(CONFIG_BF54x) || defined(CONFIG_BF52x) || defined(CONFIG_BF561) || \
-	defined(CONFIG_BF538) || defined(CONFIG_BF539) || defined(CONFIG_BF51x)
+#ifdef SIC_IWR0
 	P0.H = hi(SIC_IWR0);
 	P0.L = lo(SIC_IWR0);
 	P1.H = hi(SIC_IWR1);
 	P1.L = lo(SIC_IWR1);
 	[P1] = R1;
-#if defined(CONFIG_BF54x)
+# ifdef SIC_IWR2
 	P1.H = hi(SIC_IWR2);
 	P1.L = lo(SIC_IWR2);
 	[P1] = R2;
-#endif
+# endif
 #else
 	P0.H = hi(SIC_IWR);
 	P0.L = lo(SIC_IWR);