ARM: imx8m: Deduplicate CAAM init with arch_misc_init() call

Instead of duplicating code implemented by i.MX8M version of arch_misc_init()
in every board, enable CONFIG_ARCH_MISC_INIT and call arch_misc_init() from
spl_board_init(). This removes the duplication. No functional change.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
diff --git a/configs/imx8mp_evk_defconfig b/configs/imx8mp_evk_defconfig
index 0be1951..406e89e 100644
--- a/configs/imx8mp_evk_defconfig
+++ b/configs/imx8mp_evk_defconfig
@@ -28,6 +28,7 @@
 # CONFIG_USE_SPL_FIT_GENERATOR is not set
 CONFIG_OF_SYSTEM_SETUP=y
 CONFIG_DEFAULT_FDT_FILE="imx8mp-evk.dtb"
+CONFIG_ARCH_MISC_INIT=y
 CONFIG_BOARD_LATE_INIT=y
 CONFIG_SPL_MAX_SIZE=0x26000
 CONFIG_SPL_HAS_BSS_LINKER_SECTION=y