net: dsa: b53: Provide sensible defaults

The SRAB driver is the default way to communicate with the integrated
switch on iProc platforms and the MMAP driver is the way to communicate
with the integrated switch on DSL BCM63xx and CM BCM33xx.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/b53/Kconfig

@@ -23,6 +23,7 @@ config B53_MDIO_DRIVER
 config B53_MMAP_DRIVER
 	tristate "B53 MMAP connected switch driver"
 	depends on B53 && HAS_IOMEM
+	default BCM63XX || BMIPS_GENERIC
 	help
 	  Select to enable support for memory-mapped switches like the BCM63XX
 	  integrated switches.
@@ -30,6 +31,7 @@ config B53_MMAP_DRIVER
 config B53_SRAB_DRIVER
 	tristate "B53 SRAB connected switch driver"
 	depends on B53 && HAS_IOMEM
+	default ARCH_BCM_IPROC
 	help
 	  Select to enable support for memory-mapped Switch Register Access
 	  Bridge Registers (SRAB) like it is found on the BCM53010