[ARM] clps7500: remove support

The CLPS7500 platform has not built since 2.6.22-git7 and there
seems to be no interest in fixing it.  So, remove the platform
support.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index 27d70d3..da3c3a5 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -79,7 +79,7 @@
 
 config SERIO_RPCKBD
 	tristate "Acorn RiscPC keyboard controller"
-	depends on ARCH_ACORN || ARCH_CLPS7500
+	depends on ARCH_ACORN
 	default y
 	help
 	  Say Y here if you have the Acorn RiscPC and want to use an AT