memory_mapped: Reduce `decode_sizes` to a single `max_rom_decode`

We used to store the maximum decode size, i.e. the maximum memory-mapped
range of the flash chip, per bus type (Parallel, LPC, FWH, SPI). There
was no programmer in the tree that really made use of it, though:
* The chipset drivers usually focus on a single bus type. And even if
  they advertise the whole default set (PAR, LPC, FWH), they only pro-
  vide a maximum decode size for one of them. The latter is probably
  wrong, should really more than one bus type be supported.
* PCI and external programmers all support only a single bus type, with
  the exception of `serprog` which doesn't set a maximum decode size.

What made the distinction even less useful is that for some chips that
support multiple bus types, i.e. LPC+FWH, we can't even detect which
type it is. The existing code around this also only tried to provide
the best possible warning message at the expense of breaking the pro-
grammer abstraction.

Hence, unify the set of sizes into a single `max_rom_decode` property.
We store it inside the `registered_master` struct right away, to avoid
any more use of globals.

Change-Id: I2aaea18d5b4255eb843a625b016ee74bb145ed85
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.sourcearcade.org/c/flashprog/+/72531
diff --git a/pickit2_spi.c b/pickit2_spi.c
index 13a47f9..a7b658e 100644
--- a/pickit2_spi.c
+++ b/pickit2_spi.c
@@ -498,7 +498,7 @@
 		goto init_err_cleanup_exit;
 	}
 
-	return register_spi_master(&spi_master_pickit2, pickit2_data);
+	return register_spi_master(&spi_master_pickit2, 0, pickit2_data);
 
 init_err_cleanup_exit:
 	pickit2_shutdown(pickit2_data);