zorro: Do not allocate zorro_autocon[] statically

Currently the array of Zorro devices is allocated statically, wasting
up to 4.5 KiB when running an Amiga or multi-platform kernel on a machine
with no or a handful of Zorro expansion cards. Convert it to conditional
dynamic memory allocation to fix this.

amiga_parse_bootinfo() still needs to store some information about the
detected Zorro devices, at a time even the bootmem allocator is not yet
available.  This is now handled using a much smaller array (typically less
than 0.5 KiB), which is __initdata and thus freed later.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

include/linux/zorro.h

@@ -175,7 +175,23 @@ static inline struct zorro_driver *zorro_dev_driver(const struct zorro_dev *z)
 
 
 extern unsigned int zorro_num_autocon;	/* # of autoconfig devices found */
-extern struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];
+extern struct zorro_dev *zorro_autocon;
+
+
+    /*
+     * Minimal information about a Zorro device, passed from bootinfo
+     * Only available temporarily, i.e. until initmem has been freed!
+     */
+
+struct zorro_dev_init {
+	struct ExpansionRom rom;
+	u16 slotaddr;
+	u16 slotsize;
+	u32 boardaddr;
+	u32 boardsize;
+};
+
+extern struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata;
 
 
     /*