MAINTAINERS: take Genoa/Onyx rename into account

When soc/amd/genoa was renamed to soc/amd/genoa_poc and mb/amd/onyx
was renamed to mb/amd/onyx_poc, the MAINTAINERS file wasn't updated, so
no reviewers were added automatically to patches on Gerrit that change
things in soc/amd/genoa_poc or mb/amd/onyx_poc. Fix this by updating the
folder names in the MAINTAINERS file too.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ib52781ebc98bd2ce9df495526cfaf9d884aace50
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81679
Reviewed-by: Varshit Pandya <pandyavarshit@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 1f2458f..2963ab4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -154,7 +154,7 @@
 M:	Martin Roth <gaumless@gmail.com>
 M:	Varshit Pandya <pandyavarshit@gmail.com>
 S:	Maintained
-F:	src/mainboard/amd/onyx/
+F:	src/mainboard/amd/onyx_poc/
 
 AMD reference boards outside of family 17h and 19h
 S:	Odd Fixes
@@ -840,12 +840,12 @@
 S:	Maintained
 F:	src/soc/amd/common/
 
-AMD Genoa
+AMD Genoa Proof of Concept
 M:	Felix Held <felix-coreboot@felixheld.de>
 M:	Martin Roth <gaumless@gmail.com>
 M:	Varshit Pandya <pandyavarshit@gmail.com>
 S:	Maintained
-F:	src/soc/amd/genoa/
+F:	src/soc/amd/genoa_poc/
 
 AMD Mendocino
 M:	Felix Held <felix-coreboot@felixheld.de>