m68k: Remove M5475x boards

These board has not been converted to CONFIG_DM_PCI by the deadline.
Remove them.  As this is the last of the mcf547x_8x family of boards,
remove that support as well.

Cc: TsiChung Liew <Tsi-Chung.Liew@nxp.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/m68k/lib/cache.c b/arch/m68k/lib/cache.c
index 68f2eef..aa2b93e 100644
--- a/arch/m68k/lib/cache.c
+++ b/arch/m68k/lib/cache.c
@@ -80,7 +80,7 @@
 }
 
 /*
- * data cache only for ColdFire V4 such as MCF547x_8x, MCF5445x
+ * data cache only for ColdFire V4 such as MCF5445x
  * the dcache will be dummy in ColdFire V2 and V3
  */
 void dcache_enable(void)