Revert "sparc: correct section of current_pc()"

This reverts commit 8dd9453737822469837d48d5da3785ce70fb2118.

This fixes a boot failure reported by Robert Reif.

The code above the section change expects to fallthrough, so
we can't make such a section change here.

arch/sparc/kernel/head.S

@@ -465,7 +465,6 @@ gokernel:
 		mov	%o7, %g4		! Save %o7
 
 		/* Jump to it, and pray... */
-		__INIT
 current_pc:
 		call	1f
 		 nop