phy: realtek: Realtek PHYs should depend on ARCH_REALTEK

The Realtek SoC USB2 and USB3 PHY Transceivers are only present on
Realtek Digital Home Center (DHC) RTD series SoCs.  Hence add a
dependency on ARCH_REALTEK, to prevent asking the user about these
drivers when configuring a kernel without Realtek SoC support.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/2892527cac9af6fa8f5e7b8daeffd7d4351fde68.1692113167.git.geert+renesas@glider.be
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/realtek/Kconfig

@@ -2,6 +2,9 @@
 #
 # Phy drivers for Realtek platforms
 #
+
+if ARCH_REALTEK || COMPILE_TEST
+
 config PHY_RTK_RTD_USB2PHY
 	tristate "Realtek RTD USB2 PHY Transceiver Driver"
 	depends on USB_SUPPORT
@@ -25,3 +28,5 @@ config PHY_RTK_RTD_USB3PHY
 	  The DHC (digital home center) RTD series SoCs used the Synopsys
 	  DWC3 USB IP. This driver will do the PHY initialization
 	  of the parameters.
+
+endif # ARCH_REALTEK || COMPILE_TEST