m32r: convert to use __HEAD and HEAD_TEXT macros.

This has the consequence of changing the section name use for head
code from ".text.head" to ".head.text".  Since this commit changes all
users in the architecture, this change should be harmless.
Signed-off-by: Tim Abbott <tabbott@mit.edu>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/m32r/kernel/head.S

@@ -23,7 +23,7 @@ __INITDATA
 /*
  * References to members of the boot_cpu_data structure.
  */
-.section .text.head, "ax"
+__HEAD
 	.global	start_kernel
 	.global __bss_start
 	.global _end

arch/m32r/kernel/vmlinux.lds.S

@@ -27,7 +27,7 @@ SECTIONS
   _text = .;			/* Text and read-only data */
   .boot : { *(.boot) } = 0
   .text : {
-	*(.text.head)
+	HEAD_TEXT
 	TEXT_TEXT
 	SCHED_TEXT
 	LOCK_TEXT