realtek: fix build issues

This fixes the build problems for the REALTEK target by adding a proper
configuration option for the phy module.

Signed-off-by: Birger Koblitz <mail@birger-koblitz.de>

target/linux/realtek/config-5.4

@@ -71,6 +71,7 @@ CONFIG_GENERIC_TIME_VSYSCALL=y
 CONFIG_GPIOLIB=y
 CONFIG_GPIO_RTL8231=y
 CONFIG_GPIO_RTL838X=y
+CONFIG_REALTEK_SOC_PHY=y
 CONFIG_GRO_CELLS=y
 CONFIG_HANDLE_DOMAIN_IRQ=y
 CONFIG_HARDWARE_WATCHPOINTS=y

target/linux/realtek/patches-5.4/705-add-rtl-phy.patch

@@ -1,11 +1,25 @@
+--- a/drivers/net/phy/Kconfig
++++ b/drivers/net/phy/Kconfig
+@@ -454,6 +454,12 @@
+ 	---help---
+ 	  Supports the Realtek 821x PHY.
+
++config REALTEK_SOC_PHY
++	tristate "Realtek SoC PHYs"
++	depends on RTL838X
++	---help---
++	  Supports the PHYs found in combination with Realtek Switch SoCs
++
+ config RENESAS_PHY
+ 	tristate "Driver for Renesas PHYs"
+ 	---help---
 --- a/drivers/net/phy/Makefile
 +++ b/drivers/net/phy/Makefile
-@@ -101,7 +101,7 @@ obj-$(CONFIG_MICROSEMI_PHY)	+= mscc.o
+@@ -87,6 +87,7 @@
- obj-$(CONFIG_NATIONAL_PHY)	+= national.o
  obj-$(CONFIG_NXP_TJA11XX_PHY)	+= nxp-tja11xx.o
  obj-$(CONFIG_QSEMI_PHY)		+= qsemi.o
--obj-$(CONFIG_REALTEK_PHY)	+= realtek.o
+ obj-$(CONFIG_REALTEK_PHY)	+= realtek.o
-+obj-$(CONFIG_REALTEK_PHY)	+= realtek.o rtl83xx-phy.o
++obj-$(CONFIG_REALTEK_SOC_PHY)   += rtl83xx-phy.o
  obj-$(CONFIG_RENESAS_PHY)	+= uPD60620.o
  obj-$(CONFIG_ROCKCHIP_PHY)	+= rockchip.o
  obj-$(CONFIG_SMSC_PHY)		+= smsc.o