phy: intel: PHY_INTEL_KEEMBAY_EMMC should depend on ARCH_KEEMBAY

The Intel Keem Bay eMMC PHY is only present on Intel Keem Bay SoCs.
Hence add a dependency on ARCH_KEEMBAY, to prevent asking the user about
this driver when configuring a kernel without Intel Keem Bay platform
support.

Fixes: 885c4f4d ("phy: intel: Add Keem Bay eMMC PHY support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20201110144600.3279752-1-geert+renesas@glider.beSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/intel/Kconfig

@@ -4,7 +4,7 @@
 #
 config PHY_INTEL_KEEMBAY_EMMC
 	tristate "Intel Keem Bay EMMC PHY driver"
-	depends on (OF && ARM64) || COMPILE_TEST
+	depends on ARCH_KEEMBAY || COMPILE_TEST
 	depends on HAS_IOMEM
 	select GENERIC_PHY
 	select REGMAP_MMIO