mpc85xx: add socrates dts from linux

add socrates device tree from linux:

commit 71ae5fc87c34 ("Merge tag 'linux-kselftest-5.2-rc1' of
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest")

and added SPDX license identifier.
Did not fix checkpatch warnings:
arch/powerpc/dts/socrates.dts:235: check: Please don't use multiple blank lines
arch/powerpc/dts/socrates.dts:238: error: code indent should use tabs where possible

Also, add me as board maintainer.

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/board/socrates/MAINTAINERS b/board/socrates/MAINTAINERS
index 293b8e6..c5607fc 100644
--- a/board/socrates/MAINTAINERS
+++ b/board/socrates/MAINTAINERS
@@ -1,6 +1,7 @@
 SOCRATES BOARD
-#M:	-
+M:	Heiko Schocher <hs@denx.de>
 S:	Maintained
 F:	board/socrates/
 F:	include/configs/socrates.h
 F:	configs/socrates_defconfig
+F:	arch/powerpc/dts/socrates.dts