boards: arm64: imx8mm: rename boards name to smp and non-smp

1. In order to figure out board name easily for a-core and m-core, add
   a53 suffix in a-core board names.

2. Will support two board configures: one for non-smp and one for smp, both
   of them can boot from uboot command line or load into Jailhouse inmate,
   so remove Jaihouse suffix from board names.

Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>

boards/arm64/imx8mm_evk/Kconfig.defconfig

@@ -1,9 +1,9 @@
-# Copyright 2020 NXP
+# Copyright 2020-2022 NXP
 # SPDX-License-Identifier: Apache-2.0
 
 if BOARD_IMX8MM_EVK_A53
 
 config BOARD
-	default "imx8mm_evk"
+	default "imx8mm_evk_a53"
 
 endif # BOARD_IMX8MM_EVK_A53

boards/arm64/imx8mm_evk/imx8mm_evk_a53.yaml

@@ -1,4 +1,4 @@
-identifier: imx8mm_evk
+identifier: imx8mm_evk_a53
 name: NXP i.MX8M Mini EVK A53
 type: mcu
 arch: arm64

boards/arm64/imx8mm_evk/imx8mm_evk_a53_smp.yaml

@@ -1,5 +1,5 @@
-identifier: imx8mm_evk_jailhouse
-name: NXP i.MX8M Mini EVK A53 Jailhouse Inmate Cell
+identifier: imx8mm_evk_a53_smp
+name: NXP i.MX8M Mini EVK A53 with SMP kernel
 type: mcu
 arch: arm64
 toolchain: