Remove Firestone from MAINTAINERS

Firestone was removed here:
https://gerrit.openbmc-project.xyz/#/c/10957/
Soon this MAINTAINERS file will go away as well, waiting on
https://gerrit.openbmc-project.xyz/#/q/status:open++branch:master+topic:maintainers
to be merged.

Change-Id: I64c9aa241677f8c65900c64e5361f2e0c3655439
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 8e2fc8a..6936b7b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -150,9 +150,6 @@
 @openbmc://meta-openpower/meta-ingrasys/meta-zaius/*
 R:  Robert Lippert <rlippert@google.com> <rlippert!>
 
-@openbmc://meta-openpower/meta-ibm/meta-firestone/*
-R:  Lei YU <mine260309@gmail.com> # TODO: MISSING IRC HANDLE
-
 @openbmc://meta-openpower/meta-ibm/meta-romulus/*
 R:  Lei YU <mine260309@gmail.com> # TODO: MISSING IRC HANDLE
 R:  Joel Stanley <joel@jms.id.au> # <shenki!>