net: dsa: mt7530: improve and relax PHY driver dependency

Different MT7530 variants require different PHY drivers.
Use 'imply' instead of 'select' to relax the dependency on the PHY
driver, and choose the appropriate driver.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/Kconfig

@@ -37,7 +37,6 @@ config NET_DSA_LANTIQ_GSWIP
 config NET_DSA_MT7530
 	tristate "MediaTek MT7530 and MT7531 Ethernet switch support"
 	select NET_DSA_TAG_MTK
-	select MEDIATEK_GE_PHY
 	imply NET_DSA_MT7530_MDIO
 	imply NET_DSA_MT7530_MMIO
 	help
@@ -49,6 +48,7 @@ config NET_DSA_MT7530
 config NET_DSA_MT7530_MDIO
 	tristate "MediaTek MT7530 MDIO interface driver"
 	depends on NET_DSA_MT7530
+	imply MEDIATEK_GE_PHY
 	select PCS_MTK_LYNXI
 	help
 	  This enables support for the MediaTek MT7530 and MT7531 switch
@@ -60,6 +60,7 @@ config NET_DSA_MT7530_MMIO
 	tristate "MediaTek MT7530 MMIO interface driver"
 	depends on NET_DSA_MT7530
 	depends on HAS_IOMEM
+	imply MEDIATEK_GE_SOC_PHY
 	help
 	  This enables support for the built-in Ethernet switch found
 	  in the MediaTek MT7988 SoC.