Blackfin: dpmc: don't save/restore scratch registers

The Blackfin C ABI says we do not need to save/restore R0-R3 and P0-P2
as they are available as scratch registers.  So don't bother.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/mach-common/dpmc_modes.S

@@ -12,7 +12,7 @@
 .section .l1.text
 
 ENTRY(_sleep_mode)
-	[--SP] = ( R7:0, P5:0 );
+	[--SP] = (R7:4, P5:3);
 	[--SP] = RETS;
 
 	call _set_sic_iwr;
@@ -46,7 +46,7 @@ ENTRY(_sleep_mode)
 	call _test_pll_locked;
 
 	RETS = [SP++];
-	( R7:0, P5:0 ) = [SP++];
+	(R7:4, P5:3) = [SP++];
 	RTS;
 ENDPROC(_sleep_mode)
 
@@ -81,7 +81,7 @@ ENTRY(_hibernate_mode)
 ENDPROC(_hibernate_mode)
 
 ENTRY(_sleep_deeper)
-	[--SP] = ( R7:0, P5:0 );
+	[--SP] = (R7:4, P5:3);
 	[--SP] = RETS;
 
 	CLI R4;
@@ -175,7 +175,7 @@ ENTRY(_sleep_deeper)
 	STI R4;
 
 	RETS = [SP++];
-	( R7:0, P5:0 ) = [SP++];
+	(R7:4, P5:3) = [SP++];
 	RTS;
 ENDPROC(_sleep_deeper)