memory_bus: Move related declarations into new `chipdrivers/memory_bus.h`

Change-Id: I2bef65de77860d049ec3d9938ae777c5f929c258
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/438
diff --git a/spi25.c b/spi25.c
index d1ce38e..f45f9a2 100644
--- a/spi25.c
+++ b/spi25.c
@@ -24,8 +24,8 @@
 #include <stdbool.h>
 #include "flash.h"
 #include "flashchips.h"
-#include "chipdrivers.h"
 #include "chipdrivers/spi.h"
+#include "chipdrivers/memory_bus.h"
 #include "programmer.h"
 #include "spi_command.h"
 #include "spi.h"