Convert the remaining references to *_49fl00x

Now the only remaining and used function in pm49fl00x.c is unlock_49fl00x.

Also:
 - Add missing unlock to AMIC A49LF040A.
 - Add lock_49fl00x function.

Corresponding to flashrom svn r917.

Signed-off-by: Sean Nelson <audiohacked@gmail.com>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/pm49fl00x.c b/pm49fl00x.c
index 17a49f0..5e5eec8 100644
--- a/pm49fl00x.c
+++ b/pm49fl00x.c
@@ -43,6 +43,12 @@
 	return 0;
 }
 
+int lock_49fl00x(struct flashchip *flash)
+{
+	write_lockbits_49fl00x(flash->virtual_registers, flash->total_size * 1024, 1, flash->page_size);
+	return 0;
+}
+
 int erase_49fl00x(struct flashchip *flash)
 {
 	int i;