Blackfin: dpmc: punt unnecessary RTC_ISTAT clearing

The RTC ISTAT bits do not affect wakeups, and the RTC driver already
takes care of clearing this MMR when necessary.  So drop the useless
clearing in the core Blackfin power code.
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/mach-common/dpmc_modes.S

@@ -17,9 +17,6 @@ ENTRY(_sleep_mode)
 
 	call _set_sic_iwr;
 
-	R0 = 0xFFFF (Z);
-	call _set_rtc_istat;
-
 	P0.H = hi(PLL_CTL);
 	P0.L = lo(PLL_CTL);
 	R1 = W[P0](z);
@@ -65,9 +62,6 @@ ENTRY(_hibernate_mode)
 	call _set_dram_srfs;
 	SSYNC;
 
-	R0 = 0xFFFF (Z);
-	call _set_rtc_istat;
-
 	P0.H = hi(VR_CTL);
 	P0.L = lo(VR_CTL);
 
@@ -95,9 +89,6 @@ ENTRY(_sleep_deeper)
 	call _set_sic_iwr;
 	call _set_dram_srfs;	/* Set SDRAM Self Refresh */
 
-	/* Clear all the interrupts,bits sticky */
-	R0 = 0xFFFF (Z);
-	call _set_rtc_istat;
 	P0.H = hi(PLL_DIV);
 	P0.L = lo(PLL_DIV);
 	R6 = W[P0](z);
@@ -269,21 +260,6 @@ ENTRY(_set_sic_iwr)
 	RTS;
 ENDPROC(_set_sic_iwr)
 
-ENTRY(_set_rtc_istat)
-#ifndef CONFIG_BF561
-	P0.H = hi(RTC_ISTAT);
-	P0.L = lo(RTC_ISTAT);
-	w[P0] = R0.L;
-	SSYNC;
-#elif (ANOMALY_05000371)
-	nop;
-	nop;
-	nop;
-	nop;
-#endif
-	RTS;
-ENDPROC(_set_rtc_istat)
-
 ENTRY(_test_pll_locked)
 	P0.H = hi(PLL_STAT);
 	P0.L = lo(PLL_STAT);