IT87: Add ability to select between chips on GIGABYTE DualBIOS boards

Thanks to Vadim Girlin for finding out how to do that.
This is known to work on GA-MA770-UD3, GA-B75M-D3V, GA-B75N and
GA-H61M-S1 (only M_BIOS is populated).

Corresponding to flashrom svn r1720.

Signed-off-by: Vadim Girlin <vadimgirlin@gmail.com>
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Tested-by: Damien Zammit <damien@zamaudio.com>
Tested-by: Anton Kochkov <anton.kochkov@gmail.com>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
diff --git a/internal.c b/internal.c
index ab3c81f..30b184f 100644
--- a/internal.c
+++ b/internal.c
@@ -331,9 +331,8 @@
 		return ret;
 
 #if defined(__i386__) || defined(__x86_64__)
-	/* Probe unconditionally for IT87* LPC->SPI translation and for
-	 * IT87* Parallel write enable.
-	 */
+	/* Probe unconditionally for ITE Super I/O chips. This enables LPC->SPI translation on IT87* and
+	 * parallel writes on IT8705F. Also, this handles the manual chip select for Gigabyte's DualBIOS. */
 	init_superio_ite();
 #endif