[SPARC64]: Kill sole argument passed to setup_tba().

No longer used, and move extern declaration to a header file.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/head.S b/arch/sparc64/kernel/head.S
index 82ce5bc..2988be8 100644
--- a/arch/sparc64/kernel/head.S
+++ b/arch/sparc64/kernel/head.S
@@ -454,7 +454,7 @@
 	 restore
 
 	.globl	setup_tba
-setup_tba:	/* i0 = is_starfire */
+setup_tba:
 	save	%sp, -192, %sp
 
 	/* The boot processor is the only cpu which invokes this