ls1021atwr: caam: Enable Uboot validaion in SPL.

caam driver model enabled in spl for secure boot.
fsl_rsa_mod_exp driver enabled in spl for validating uboot image.

Signed-off-by: Gaurav Jain <gaurav.jain@nxp.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index fa8c13f..5857fbf 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1499,5 +1499,6 @@
 CAAM
 M:	Gaurav Jain <gaurav.jain@nxp.com>
 S:	Maintained
+F:	arch/arm/dts/ls1021a-twr-u-boot.dtsi
 F:	drivers/crypto/fsl/
 F:	include/fsl_sec.h