[CODEOWNERS] Remove msf from codeowners file

There are automatic reviewer assignmnets based on the
codeowners file. msf is not attached to the project anymore.
So it's quite annyoing to get PRs automatically to him
assigned. Probagly for him as well.

Signed-off-by: Robert Schilling <[email protected]>

Author: Razer6

.github/CODEOWNERS

@@ -27,19 +27,9 @@
 /WORKSPACE          @cfrantz
 /.bazelrc           @cfrantz
 
-# Utils: reggen, topgen, tlgen
-util/*gen/          @msfschaffner
-util/tlgen.py       @msfschaffner
-util/topgen.py      @msfschaffner
-
 # RTL related
 /hw/ip/aes/             @vogelpi
-/hw/ip/alert_handler/   @msfschaffner
-/hw/ip/pinmux/          @msfschaffner
 /hw/ip/rv_dm/           @vogelpi
-/hw/top_*/doc/top_*     @msfschaffner
-/hw/top_*/ip/ast        @msfschaffner
-
 
 # DV related common files
 dv/                 @lowRISC/ot-dv-reviewers