phy: microchip: PHY_SPARX5_SERDES should depend on ARCH_SPARX5

The Microchip Sparx5 SerDes PHY is present only Microchip Sparx5 SoCs.
Hence add a dependency on ARCH_SPARX5, to prevent asking the user about
this driver when configuring a kernel without support for Sparx5 SoCs.

Fixes: 2ff8a1ee ("phy: Add Sparx5 ethernet serdes PHY driver")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210331081937.367408-1-geert+renesas@glider.beSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/microchip/Kconfig

@@ -6,6 +6,7 @@
 config PHY_SPARX5_SERDES
 	tristate "Microchip Sparx5 SerDes PHY driver"
 	select GENERIC_PHY
+	depends on ARCH_SPARX5 || COMPILE_TEST
 	depends on OF
 	depends on HAS_IOMEM
 	help