spi: Use bus probing for ST95 RDID

As the SPI instruction used for probing conflicts with AT45DB chips,
let it only run at priority `1', when no flash chip was detected.

Change-Id: I61db0d6fa7be81d120bc84213c358498019dc52d
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/420
diff --git a/flashchips.c b/flashchips.c
index 1722bc3..eb8e2fe 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -21278,7 +21278,7 @@
 		.feature_bits	= FEATURE_WRSR_WREN | FEATURE_NO_ERASE | FEATURE_ERASED_ZERO,
 		.tested		= TEST_OK_PREW,
 		.spi_cmd_set	= SPI95,
-		.probe		= probe_spi_st95,
+		.probe		= probe_buses,
 		.probe_timing	= TIMING_ZERO,
 		.block_erasers	=
 		{