sparc: unify kernel/init_task

A closer inspection revealed that these two files had identical
functionality - but the implementation of it differed slightly.

Base it on the sparc version as it was the best.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/Makefile b/arch/sparc/Makefile
index efc9071..2003ded 100644
--- a/arch/sparc/Makefile
+++ b/arch/sparc/Makefile
@@ -68,7 +68,7 @@
 endif
 
 head-y                 := arch/sparc/kernel/head_$(BITS).o
-head-y                 += arch/sparc/kernel/init_task_$(BITS).o
+head-y                 += arch/sparc/kernel/init_task.o
 
 core-y                 += arch/sparc/kernel/
 core-y                 += arch/sparc/mm/ arch/sparc/math-emu/