digilent_spi: Avoid deprecated libusb functions

libusb 1.0.22 marked libusb_set_debug as deprecated. For such versions of
libusb, use libusb_set_option instead.

Change-Id: Ie139de36f15c4f4d87787cab0f968a2f0e6f0c8c
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/27503
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/digilent_spi.c b/digilent_spi.c
index 458e1b6..d42c90f 100644
--- a/digilent_spi.c
+++ b/digilent_spi.c
@@ -386,7 +386,11 @@
 		return -1;
 	}
 
+#if LIBUSB_API_VERSION < 0x01000106
 	libusb_set_debug(NULL, 3);
+#else
+	libusb_set_option(NULL, LIBUSB_OPTION_LOG_LEVEL, LIBUSB_LOG_LEVEL_INFO);
+#endif
 
 	uint16_t vid = devs_digilent_spi[0].vendor_id;
 	uint16_t pid = devs_digilent_spi[0].device_id;