Blackfin arch: add missing implementations SIC_IWR crosses several registers

SIC_IWR crosses several registers
 - add missing implementations
 - make sure SIC_IWR is SET after boot

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/arch/blackfin/mach-common/ints-priority-sc.c b/arch/blackfin/mach-common/ints-priority-sc.c
index cec0f84..27838da 100644
--- a/arch/blackfin/mach-common/ints-priority-sc.c
+++ b/arch/blackfin/mach-common/ints-priority-sc.c
@@ -472,8 +472,12 @@
 	bfin_write_SIC_IMASK0(SIC_UNMASK_ALL);
 	bfin_write_SIC_IMASK1(SIC_UNMASK_ALL);
 	bfin_write_SIC_IMASK2(SIC_UNMASK_ALL);
+	bfin_write_SIC_IWR0(IWR_ENABLE_ALL);
+	bfin_write_SIC_IWR1(IWR_ENABLE_ALL);
+	bfin_write_SIC_IWR2(IWR_ENABLE_ALL);		
 #else
 	bfin_write_SIC_IMASK(SIC_UNMASK_ALL);
+	bfin_write_SIC_IWR(IWR_ENABLE_ALL);
 #endif
 
 	SSYNC();