m32r: don't offer CONFIG_ISA

As far as I know no M32R hardware actually has ISA slots.

And ISA drivers don't compile on M32R.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>

arch/m32r/Kconfig

@@ -406,11 +406,7 @@ config PCI_DIRECT
 source "drivers/pci/Kconfig"
 
 config ISA
-	bool "ISA support"
-	help
-	  Find out whether you have ISA slots on your motherboard.  ISA is the
-	  name of a bus system, i.e. the way the CPU talks to the other stuff
-	  inside your box.  If you have ISA, say Y, otherwise N.
+	bool
 
 source "drivers/pcmcia/Kconfig"