imx: imx8m: Imply CPU_IMX by default

The imx8_cpu driver is a CPU Driver that supports the i.MX8M
family, and when it is enabled, it acts as an alternative to
arch/arm/mach-imx/cpu.c, but the imx8_cpu supports the driver
model where cpu.c does not.  Imply this newer driver by default.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/arch/arm/mach-imx/imx8m/Kconfig b/arch/arm/mach-imx/imx8m/Kconfig
index 8ee699a..31f2f00 100644
--- a/arch/arm/mach-imx/imx8m/Kconfig
+++ b/arch/arm/mach-imx/imx8m/Kconfig
@@ -8,6 +8,8 @@
 	select LTO
 	select ROM_UNIFIED_SECTIONS
 	select ARMV8_CRYPTO
+	imply CPU
+	imply CPU_IMX
 	imply IMX_TMU
 
 config IMX8MQ