xtensa: add support for the xtensa processor architecture [1/2]

The Xtensa processor architecture is a configurable, extensible,
and synthesizable 32-bit RISC processor core provided by Cadence.

This is the first part of the basic architecture port with changes to
common files. The 'arch/xtensa' directory, and boards and additional
drivers will be in separate commits.

Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 8905f88..e0bf679 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -454,6 +454,11 @@
 T:	git git://git.denx.de/u-boot-x86.git
 F:	arch/x86/
 
+XTENSA
+M:	Max Filippov <jcmvbkbc@gmail.com>
+S:	Maintained
+F:	arch/xtensa/
+
 THE REST
 M:	Tom Rini <trini@konsulko.com>
 L:	u-boot@lists.denx.de