phy: freescale: i.MX8 PHYs should depend on ARCH_MXC && ARM64

The Freescale/NXP i.MX8 USB3, MIPI DSI, and PCIE PHYs are only present
on the NXP i.MX8 family of SoCs.  Hence wrap the config symbols for
these PHYs inside a check for ARCH_MXC && ARM64, to prevent asking the
user about these drivers when configuring a kernel without NXP i.MX SoC
family support.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Guido Günther <agx@sigxcpu.org>
Link: https://lore.kernel.org/r/393868affd830016d35f0d9aba32ccd7098c8073.1641987369.git.geert+renesas@glider.beSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/freescale/Kconfig

 # SPDX-License-Identifier: GPL-2.0-only
+
+if (ARCH_MXC && ARM64) || COMPILE_TEST
+
 config PHY_FSL_IMX8MQ_USB
 	tristate "Freescale i.MX8M USB3 PHY"
 	depends on OF && HAS_IOMEM
@@ -22,3 +25,5 @@ config PHY_FSL_IMX8M_PCIE
 	help
 	  Enable this to add support for the PCIE PHY as found on
 	  i.MX8M family of SOCs.
+
+endif