PCMCIA: add Kconfig control for building sa11xx_base.c

sa11xx_base.c is currently built when either PCMCIA_SA1100 or
PCMCIA_SA1111 are selected.  Let's move the logic into Kconfig.

Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/drivers/pcmcia/Kconfig b/drivers/pcmcia/Kconfig
index f9e3fb3..b7f3d29 100644
--- a/drivers/pcmcia/Kconfig
+++ b/drivers/pcmcia/Kconfig
@@ -183,10 +183,14 @@
 config PCMCIA_SOC_COMMON
 	tristate
 
+config PCMCIA_SA11XX_BASE
+	tristate
+
 config PCMCIA_SA1100
 	tristate "SA1100 support"
 	depends on ARM && ARCH_SA1100 && PCMCIA
 	select PCMCIA_SOC_COMMON
+	select PCMCIA_SA11XX_BASE
 	help
 	  Say Y here to include support for SA11x0-based PCMCIA or CF
 	  sockets, found on HP iPAQs, Yopy, and other StrongARM(R)/
@@ -198,6 +202,7 @@
 	tristate "SA1111 support"
 	depends on ARM && ARCH_SA1100 && SA1111 && PCMCIA
 	select PCMCIA_SOC_COMMON
+	select PCMCIA_SA11XX_BASE
 	help
 	  Say Y  here to include support for SA1111-based PCMCIA or CF
 	  sockets, found on the Jornada 720, Graphicsmaster and other