build(corstone1000): rename diphda to corstone1000

diphda platform is now being renamed to corstone1000.
These changes are to replace all the instances and traces
of diphda  corstone1000.

Change-Id: I330f3a112d232b99b4721b6bf0236253b068dbba
Signed-off-by: Arpita S.K <Arpita.S.K@arm.com>
Signed-off-by: Vishnu Banavath <vishnu.banavath@arm.com>
diff --git a/docs/about/maintainers.rst b/docs/about/maintainers.rst
index 94c63f4..8e169ae 100644
--- a/docs/about/maintainers.rst
+++ b/docs/about/maintainers.rst
@@ -427,7 +427,7 @@
 :|G|: `vishnu-banavath`_
 :|F|: plat/arm/board/corstone700
 :|F|: plat/arm/board/a5ds
-:|F|: plat/arm/board/diphda
+:|F|: plat/arm/board/corstone1000
 
 Arm Reference Design platform ports
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^