block/z2ram: Remove duplicate external declarations

Remove the external declarations for m68k_realnum_memory and m68k_memory,
which are already provided by <asm/setup.h>, to avoid conflicts later.
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>

drivers/block/z2ram.c

@@ -43,9 +43,6 @@
 #include <linux/zorro.h>
 
 
-extern int m68k_realnum_memory;
-extern struct mem_info m68k_memory[NUM_MEMINFO];
-
 #define Z2MINOR_COMBINED      (0)
 #define Z2MINOR_Z2ONLY        (1)
 #define Z2MINOR_CHIPONLY      (2)