codeowners: generate board section only (drop hardcoded owners)

Per request, the generated CODEOWNERS is now purely data-driven: drop the
hardcoded header owners (the default '* @igorpecovnik' and the *.md / .github/ /
lib/ / packages/ / tools/ section owners) so the file contains only the board
section derived from BOARD_MAINTAINER. Everything in it is now sourced from the
contacts DB and subject to the inactive-maintainer filter — no static entries.

Note: with the default owner gone, paths not matched by a board pattern have no
required reviewer (intended).

Signed-off-by: Igor Pecovnik <igor@armbian.com>

Author: igorpecovnik

.github/generate_CODEOWNERS.sh

@@ -40,7 +40,7 @@ function generate_for_board() {
 			[[ -n "${INACTIVE[$_m]:-}" ]] || maintainers+="@${_m} "
 		done
 		maintainers="${maintainers% }"
-		# all maintainers inactive -> emit no entry, so the default owner applies
+		# all maintainers inactive -> emit no entry (the path simply gets no owner)
 		[[ -n "${maintainers}" ]] || return
 
 		while read -r BRANCH; do
@@ -115,20 +115,6 @@ cat <<-EOF >"${SRC}/.github/CODEOWNERS"
 	# PLEASE DON'T EDIT THIS FILE
 	# Auto generated by ".github/generate_CODEOWNERS.sh"
 
-	# Default code owner
-	*			@igorpecovnik
-
-	# the last matching pattern takes the most
-
-	*.md			@EvilOlaf @littlecxm @TheLinuxBug @TRSx80 @igorpecovnik
-	
-	.github/		@igorpecovnik @rpardini @hzyitc
-
-	lib/			@armbian/build-scripts
-	packages/		@armbian/build-scripts
-	packages/bsp/jethub/	@armbian/build-scripts @adeepn
-	tools/			@iav @neheb @hzyitc @mhoffrog
-
 	# The following contents are generated by board configs
 	$(generate_for_all_board | merge)
 EOF