tree: provide flashrom context into programmer_delay()

Modify the `programmer_delay` function signature to allow passing
the flashrom context. Programmers that depend on internal delay
should provide NULL as a context. The use of this function parameter
will be introduced in CB:67393.

TOPIC=programmer_handle_global
TEST=builds

Change-Id: Ibb0bce26ce2052853ee52158d7ba742967a9e229
Signed-off-by: Alexander Goncharov <chat@joursoir.net>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/66373
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>

at45db.c

@@ -309,7 +309,7 @@ static int at45db_wait_ready (struct flashctx *flash, unsigned int us, unsigned
 			return 0;
 		if (ret != 0 || retries-- == 0)
 			return 1;
-		programmer_delay(us);
+		programmer_delay(flash, us);
 	}
 }