sim: bfin: fix -Wshadow=local warnings

Rename the shadowed var to avoid confusion with the function argument
as to which address this code is using.
diff --git a/sim/bfin/dv-bfin_mmu.c b/sim/bfin/dv-bfin_mmu.c
index c14e208..3d24434 100644
--- a/sim/bfin/dv-bfin_mmu.c
+++ b/sim/bfin/dv-bfin_mmu.c
@@ -144,7 +144,7 @@
       *valuep = value;
       if (value)
 	{
-	  bu32 addr = mmu->sram_base_address   |
+	  bu32 sram_addr = mmu->sram_base_address   |
 	    ((value >> (26 - 11)) & (1 << 11)) | /* addr bit 11 (Way0/Way1)   */
 	    ((value >> (24 - 21)) & (1 << 21)) | /* addr bit 21 (Data/Inst)   */
 	    ((value >> (23 - 15)) & (1 << 15)) | /* addr bit 15 (Data Bank)   */
@@ -157,9 +157,9 @@
 	    hw_abort (me, "DTEST_COMMAND bits undefined");
 
 	  if (value & TEST_WRITE)
-	    sim_write (hw_system (me), addr, mmu->dtest_data, 8);
+	    sim_write (hw_system (me), sram_addr, mmu->dtest_data, 8);
 	  else
-	    sim_read (hw_system (me), addr, mmu->dtest_data, 8);
+	    sim_read (hw_system (me), sram_addr, mmu->dtest_data, 8);
 	}
       break;
     default: