configs: imx8m: enable the 'cpu' command

Enable the 'cpu' command and the depended imx CPU driver to
display the CPU info and release CPU core to run baremetal
or RTOS applications.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
diff --git a/configs/imx8mm_evk_defconfig b/configs/imx8mm_evk_defconfig
index ff33d15..8b04586 100644
--- a/configs/imx8mm_evk_defconfig
+++ b/configs/imx8mm_evk_defconfig
@@ -118,3 +118,6 @@
 CONFIG_USB_GADGET_DOWNLOAD=y
 CONFIG_SPL_USB_SDP_SUPPORT=y
 CONFIG_IMX_WATCHDOG=y
+CONFIG_CPU=y
+CONFIG_CPU_IMX=y
+CONFIG_CMD_CPU=y
diff --git a/configs/imx8mn_evk_defconfig b/configs/imx8mn_evk_defconfig
index 2402e9e..ee7a5e9 100644
--- a/configs/imx8mn_evk_defconfig
+++ b/configs/imx8mn_evk_defconfig
@@ -105,3 +105,6 @@
 CONFIG_SYSRESET_WATCHDOG=y
 CONFIG_DM_THERMAL=y
 CONFIG_IMX_WATCHDOG=y
+CONFIG_CPU=y
+CONFIG_CPU_IMX=y
+CONFIG_CMD_CPU=y
diff --git a/configs/imx8mp_evk_defconfig b/configs/imx8mp_evk_defconfig
index f5ba022..3176069 100644
--- a/configs/imx8mp_evk_defconfig
+++ b/configs/imx8mp_evk_defconfig
@@ -137,3 +137,6 @@
 CONFIG_USB_GADGET_VENDOR_NUM=0x0525
 CONFIG_USB_GADGET_PRODUCT_NUM=0xa4a5
 CONFIG_IMX_WATCHDOG=y
+CONFIG_CPU=y
+CONFIG_CPU_IMX=y
+CONFIG_CMD_CPU=y