net: arc_emac: add dependencies on associated arches and compile test

Add dependencies on the architectures that support these devices and
add compile test to ensure ongoing code build coverage.
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/arc/Kconfig

@@ -17,13 +17,14 @@ if NET_VENDOR_ARC
 
 config ARC_EMAC_CORE
 	tristate
+	depends on ARC || ARCH_ROCKCHIP || COMPILE_TEST
 	select MII
 	select PHYLIB
 
 config ARC_EMAC
 	tristate "ARC EMAC support"
 	select ARC_EMAC_CORE
-	depends on OF_IRQ && OF_NET && HAS_DMA
+	depends on OF_IRQ && OF_NET && HAS_DMA && (ARC || COMPILE_TEST)
 	---help---
 	  On some legacy ARC (Synopsys) FPGA boards such as ARCAngel4/ML50x
 	  non-standard on-chip ethernet device ARC EMAC 10/100 is used.
@@ -32,7 +33,7 @@ config ARC_EMAC
 config EMAC_ROCKCHIP
 	tristate "Rockchip EMAC support"
 	select ARC_EMAC_CORE
-	depends on OF_IRQ && OF_NET && REGULATOR && HAS_DMA
+	depends on OF_IRQ && OF_NET && REGULATOR && HAS_DMA && (ARCH_ROCKCHIP || COMPILE_TEST)
 	---help---
 	  Support for Rockchip RK3036/RK3066/RK3188 EMAC ethernet controllers.
 	  This selects Rockchip SoC glue layer support for the