sh: hd64461: Fix up I/O base register offsets.

hd64461 is mapped in a fixed location, so the I/O base itself is fairly
meaningless as a configuration item. Additionally, this makes it
impossible to share hd64461 code alongside generic drivers (in the case
of sh_dac_audio), so simply make it commonly defined and permit the
mach_is_foo() logic to work out the proper semantics.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/cchips/Kconfig

@@ -34,11 +34,6 @@ config HD64461_IRQ
 
 	  Do not change this unless you know what you are doing.
 
-config HD64461_IOBASE
-	hex "HD64461 start address"
-	depends on HD64461
-	default "0xb0000000"
-
 config HD64461_ENABLER
 	bool "HD64461 PCMCIA enabler"
 	depends on HD64461