net: thunderx: remove effective "default y" from Kconfig if ARCH_THUNDER=y

As well as for kernels built only for ThunderX ARCH_THUNDERX is also enabled
for kernels which support multiple platforms (such as distro kernels). Thus
"default ARCH_THUNDER" is inappropriate.

I believe default m is equally frowned upon, so remove the line completely
rather than "default m if ARCH_THUNDER".
Signed-off-by: Ian Campbell <ijc@hellion.org.uk>
Cc: Sunil Goutham <sgoutham@cavium.com>
Cc: Robert Richter <rric@kernel.org>
Cc: Derek Chickles <derek.chickles@caviumnetworks.com>
Cc: Satanand Burla <satananda.burla@caviumnetworks.com>
Cc: Felix Manlunas <felix.manlunas@caviumnetworks.com>
Cc: Raghu Vatsavayi <raghu.vatsavayi@caviumnetworks.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/Kconfig

@@ -16,7 +16,6 @@ if NET_VENDOR_CAVIUM
 config THUNDER_NIC_PF
 	tristate "Thunder Physical function driver"
 	depends on 64BIT
-	default ARCH_THUNDER
 	select THUNDER_NIC_BGX
 	---help---
 	  This driver supports Thunder's NIC physical function.
@@ -29,14 +28,12 @@ config THUNDER_NIC_PF
 config THUNDER_NIC_VF
 	tristate "Thunder Virtual function driver"
 	depends on 64BIT
-	default ARCH_THUNDER
 	---help---
 	  This driver supports Thunder's NIC virtual function
 
 config	THUNDER_NIC_BGX
 	tristate "Thunder MAC interface driver (BGX)"
 	depends on 64BIT
-	default ARCH_THUNDER
 	---help---
 	  This driver supports programming and controlling of MAC
 	  interface from NIC physical function driver.