Add Intel Gigabit NIC SPI flashing support

Tested on a 82541PI (0x8086, 0x107c) using 32-bit hardware.

The last line in nicintel_request_spibus() could be changed so that FL_BUSY
is used instead.

Shortened sample log:
[...]
Found "Intel 82541PI Gigabit Ethernet Controller" (8086:107c, BDF 01:03.0).
Found chip "ST M25P10.RES" (128 KB, SPI) at physical address 0xfffe0000.
Multiple flash chips were detected: M25P05.RES M25P10.RES
Please specify which chip to use with the -c <chipname> option.
[...]

Corresponding to flashrom svn r1151.

Signed-off-by: Idwer Vollering <vidwer@gmail.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
diff --git a/print.c b/print.c
index 13d7fa5..3215c2a 100644
--- a/print.c
+++ b/print.c
@@ -255,6 +255,9 @@
 #if CONFIG_ATAHPT == 1
 		print_supported_pcidevs(ata_hpt);
 #endif
+#if CONFIG_NICINTEL_SPI == 1
+		print_supported_pcidevs(nics_intel_spi);
+#endif
 
 #if CONFIG_FT2232_SPI+CONFIG_DEDIPROG >= 1
 		printf("\nSupported USB devices flashrom can use "