spi25: Drop stale `bus == SPI` guards

These guards were necessary workarounds because we used to call
the functions from core flashprog code. Now that the related code
is contained in the chip driver, we can drop them.

Change-Id: Ib06044a716e2d1c295d902877d0342deb2d78908
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/72518
diff --git a/include/programmer.h b/include/programmer.h
index 4fee2ef..5d80b56 100644
--- a/include/programmer.h
+++ b/include/programmer.h
@@ -490,13 +490,11 @@
 /* spi_master feature checks */
 static inline bool spi_master_4ba(const struct flashctx *const flash)
 {
-	return flash->mst->buses_supported & BUS_SPI &&
-		flash->mst->spi.features & SPI_MASTER_4BA;
+	return flash->mst->spi.features & SPI_MASTER_4BA;
 }
 static inline bool spi_master_no_4ba_modes(const struct flashctx *const flash)
 {
-	return flash->mst->buses_supported & BUS_SPI &&
-		flash->mst->spi.features & SPI_MASTER_NO_4BA_MODES;
+	return flash->mst->spi.features & SPI_MASTER_NO_4BA_MODES;
 }
 
 /* usbdev.c */