MAINTAINERS: Add myself (Matt DeVillier) as a maintainer for all AMD SoCs

Change-Id: I16b3a3b01b54c7bb779f13a76bbd45bee1c864f7
Signed-off-by: Matt DeVillier (AMD) <matt.devillier@amd.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66029
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 69a2fc2..befc0a5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -620,6 +620,7 @@
 M:	Jason Glenesk <jason.glenesk@gmail.com>
 M:	Raul E Rangel <rrangel@chromium.org>
 M:	Fred Reitberger <reitbergerfred@gmail.com>
+M:	Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
 S:	Maintained
 F:	src/soc/amd/cezanne/
 F:	src/vendorcode/amd/fsp/cezanne/
@@ -630,6 +631,7 @@
 M:	Jason Glenesk <jason.glenesk@gmail.com>
 M:	Raul E Rangel <rrangel@chromium.org>
 M:	Fred Reitberger <reitbergerfred@gmail.com>
+M:	Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
 S:	Maintained
 F:	src/soc/amd/common/
 
@@ -639,6 +641,7 @@
 M:	Jason Glenesk <jason.glenesk@gmail.com>
 M:	Raul E Rangel <rrangel@chromium.org>
 M:	Fred Reitberger <reitbergerfred@gmail.com>
+M:	Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
 S:	Maintained
 F:	src/soc/amd/picasso/
 F:	src/vendorcode/amd/fsp/picasso/
@@ -649,6 +652,7 @@
 M:	Jason Glenesk <jason.glenesk@gmail.com>
 M:	Raul E Rangel <rrangel@chromium.org>
 M:	Fred Reitberger <reitbergerfred@gmail.com>
+M:	Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
 S:	Maintained
 F:	src/soc/amd/sabrina/
 F:	src/vendorcode/amd/fsp/sabrina/
@@ -656,6 +660,7 @@
 AMD Stoneyridge
 M:	Marshall Dawson <marshalldawson3rd@gmail.com>
 M:	Felix Held <felix-coreboot@felixheld.de>
+M:	Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
 S:	Odd Fixes
 F:	src/soc/amd/stoneyridge/