phy: intel-lgm-emmc: Add architecture dependency

The Intel eMMC PHY is only present on Intel Lightning Mountain SoCs.
Add an architecture dependency to the PHY_INTEL_EMMC config symbol, to
avoid asking the user about it when configuring a kernel for a non-x86
architecture.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200507113626.24026-3-geert+renesas@glider.beSigned-off-by: Kishon Vijay Abraham I <kishon@ti.com>

drivers/phy/intel/Kconfig

@@ -4,6 +4,7 @@
 #
 config PHY_INTEL_EMMC
 	tristate "Intel EMMC PHY driver"
+	depends on X86 || COMPILE_TEST
 	select GENERIC_PHY
 	help
 	  Enable this to support the Intel EMMC PHY