powerpc: Use TEXT_TEXT macro in linker script.

Rather than adding .ref.text to the powerpc linker script so that we
can use __REF on the powerpc architecture, it seems simpler to switch
to using the generic TEXT_TEXT macro.
Signed-off-by: Tim Abbott <tabbott@mit.edu>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/powerpc/kernel/vmlinux.lds.S

@@ -54,7 +54,8 @@ SECTIONS
 		ALIGN_FUNCTION();
 		HEAD_TEXT
 		_text = .;
-		*(.text .fixup .text.init.refok .exit.text.refok __ftr_alt_*)
+		TEXT_TEXT
+		*(.fixup __ftr_alt_*)
 		SCHED_TEXT
 		LOCK_TEXT
 		KPROBES_TEXT