soc/amd: Change Morgana codename to Phoenix

Now that the next generation of APUs is officially announced, we can
unmask morgana.

The chip formerly known as Morgana is actually Phoenix.

Surprise!

This patch just changes the name across the entire codebase.

Note that the fw.cfg file will stay pointing to the
3rdparty/amd_blobs/morgana/psp directory until the amd_blobs_repo is
updated.

Signed-off-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Change-Id: Ie9492a30ae9ff9cd7e15e0f2d239c32190ad4956
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71731
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Jason Glenesk <jason.glenesk@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index aefc432..6ab5ec0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -815,15 +815,15 @@
 F:	src/soc/amd/mendocino/
 F:	src/vendorcode/amd/fsp/mendocino/
 
-AMD Morgana
+AMD Phoenix
 M:	Felix Held <felix-coreboot@felixheld.de>
 M:	Jason Glenesk <jason.glenesk@gmail.com>
 M:	Fred Reitberger <reitbergerfred@gmail.com>
 M:	Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
 L:	amd_coreboot_org_changes@googlegroups.com
 S:	Supported
-F:	src/soc/amd/morgana/
-F:	src/vendorcode/amd/fsp/morgana/
+F:	src/soc/amd/phoenix/
+F:	src/vendorcode/amd/fsp/phoenix/
 
 AMD Stoneyridge
 M:	Felix Held <felix-coreboot@felixheld.de>