configs: imx8m: Prepare imx8m-venice boards for HAB support

In order to enable HAB, FSL_CAAM, ARCH_MISC_INIT and
SPL_CRYPTO should be enabled in Kconfig like other i.MX8M
boards.

This also needs to occur in the SPL so enable CONFIG_SPL_BOARD_INIT and
add a void spl_board_init function which calls arch_misc_init to probe
the CAAM driver.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
diff --git a/board/gateworks/venice/spl.c b/board/gateworks/venice/spl.c
index 606738a..5aa2095 100644
--- a/board/gateworks/venice/spl.c
+++ b/board/gateworks/venice/spl.c
@@ -373,3 +373,8 @@
 		return NULL;
 	}
 }
+
+void spl_board_init(void)
+{
+	arch_misc_init();
+}