[ARM] pxa: restrict availability of pxa2xx PCMCIA drivers

Not all PXA2xx platforms provide the necessary support files for
PCMCIA to work, let alone build.  Stop the build errors by making
PXA2xx PCMCIA support only available on those platforms which have
supplied the support files.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/pcmcia/Kconfig

@@ -200,6 +200,7 @@ config PCMCIA_AU1X00
 config PCMCIA_SA1100
 	tristate "SA1100 support"
 	depends on ARM && ARCH_SA1100 && PCMCIA
+	depends on ARCH_LUBBOCK || MACH_MAINSTONE || PXA_SHARPSL || MACH_ARMCORE
 	help
 	  Say Y here to include support for SA11x0-based PCMCIA or CF
 	  sockets, found on HP iPAQs, Yopy, and other StrongARM(R)/