Add support for stack-protector

Add support for stack protector for UBOOT, SPL, and TPL
as well as new pytest for stackprotector

Signed-off-by: Joel Peshkin <joel.peshkin@broadcom.com>

Adjust UEFI build flags.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index c6dd9bf..2d267ae 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1062,6 +1062,13 @@
 F:	cmd/sqfs.c
 F:	test/py/tests/test_fs/test_squashfs/
 
+STACKPROTECTOR
+M:	Joel Peshkin <joel.peshkin@broadcom.com>
+S:	Maintained
+F:	common/stackprot.c
+F:	cmd/stackprot_test.c
+F:	test/py/tests/test_stackprotector.py
+
 TARGET_BCMNS3
 M:	Bharat Gooty <bharat.gooty@broadcom.com>
 M:	Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>