Add -E option for chip erase, remove duplicated code

Corresponding to flashrom svn r30 and coreboot v2 svn r1815.
diff --git a/sst39sf020.c b/sst39sf020.c
index 401247a..97e87a1 100644
--- a/sst39sf020.c
+++ b/sst39sf020.c
@@ -51,22 +51,18 @@
 {
 	int i;
 	int total_size = flash->total_size * 1024, page_size =
-	    flash->page_size;
+		flash->page_size;
 	volatile char *bios = flash->virt_addr;
 
 	erase_chip_jedec(flash);
 
 	printf("Programming Page: ");
 	for (i = 0; i < total_size / page_size; i++) {
-		/* erase the page before programming */
-		//erase_sector_39sf020(bios, i * page_size);
-
 		/* write to the sector */
 		printf("%04d at address: 0x%08x", i, i * page_size);
 		write_sector_jedec(bios, buf + i * page_size,
 				   bios + i * page_size, page_size);
-		printf
-		    ("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
+		printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
 		fflush(stdout);
 	}
 	printf("\n");