Add programmer-specific delay functions

Add external programmer delay functions so external programmers can
handle the delay on their own if needed.

Corresponding to flashrom svn r578.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Urja Rannikko <urjaman@gmail.com>
diff --git a/w39v080fa.c b/w39v080fa.c
index ba4673a..8dc882a 100644
--- a/w39v080fa.c
+++ b/w39v080fa.c
@@ -29,7 +29,7 @@
 	chip_writeb(0xAA, bios + 0x5555);
 	chip_writeb(0x55, bios + 0x2AAA);
 	chip_writeb(0x90, bios + 0x5555);
-	myusec_delay(10);
+	programmer_delay(10);
 
 	/* Read product ID */
 	id1 = chip_readb(bios);
@@ -39,7 +39,7 @@
 	chip_writeb(0xAA, bios + 0x5555);
 	chip_writeb(0x55, bios + 0x2AAA);
 	chip_writeb(0xF0, bios + 0x5555);
-	myusec_delay(10);
+	programmer_delay(10);
 
 	printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
 
@@ -108,7 +108,7 @@
 	chip_writeb(0xAA, bios + 0x5555);
 	chip_writeb(0x55, bios + 0x2AAA);
 	chip_writeb(0x90, bios + 0x5555);
-	myusec_delay(10);
+	programmer_delay(10);
 
 	/* Read Hardware Lock Bits */
 	locking = chip_readb(bios + 0xffff2);
@@ -117,7 +117,7 @@
 	chip_writeb(0xAA, bios + 0x5555);
 	chip_writeb(0x55, bios + 0x2AAA);
 	chip_writeb(0xF0, bios + 0x5555);
-	myusec_delay(10);
+	programmer_delay(10);
 
 	printf_debug("Lockout bits:\n");