probing: Pass full struct flashchip into probes

In case we want to probe for a particular chip, we can filter the
actual probing sequences by its properties.

We'll use `struct flashchip` internally and `struct flashprog_chip`
will be used only close to the libflashprog API.  This way, we can
separate the two later again if necessary.

Change-Id: Id8b13d28fcaefee62746c9391fe86b4b3b09a428
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/441
diff --git a/include/flash.h b/include/flash.h
index 0f14037..aca1b77 100644
--- a/include/flash.h
+++ b/include/flash.h
@@ -244,8 +244,7 @@
 	PREPARE_FULL,
 };
 
-#define flashchip flashprog_chip
-struct flashprog_chip {
+struct flashchip {
 	const char *vendor;
 	const char *name;