Add serial port bitbanging code

This adds the pony_spi driver which supports the SI_Prog adapter, which
is commonly used for SPI chips with PonyProg 2000, and a custom adapter
called "SERBANG" which differs in the logic of two pins.

Corresponding to flashrom svn r1525.

Signed-off-by: Virgil-Adrian Teaca <darkstarlinux@gmail.com>
Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
diff --git a/print.c b/print.c
index 84a1604..0980570 100644
--- a/print.c
+++ b/print.c
@@ -507,6 +507,12 @@
 	/* FIXME */
 	msg_ginfo("RayeR parallel port programmer\n");
 #endif
+#if CONFIG_PONY_SPI == 1
+	msg_ginfo("\nSupported devices for the %s programmer:\n",
+	       programmer_table[PROGRAMMER_PONY_SPI].name);
+	/* FIXME */
+	msg_ginfo("SI-Prog and SERBANG serial port programmer\n");
+#endif
 #if CONFIG_NICINTEL == 1
 	msg_ginfo("\nSupported devices for the %s programmer:\n",
 	       programmer_table[PROGRAMMER_NICINTEL].name);