codeowners: Make system group as esp_pm codeowners
/components/esp_netif/ @esp-idf-codeowners/network
/components/esp_partition/ @esp-idf-codeowners/storage
/components/esp_phy/ @esp-idf-codeowners/bluetooth @esp-idf-codeowners/wifi @esp-idf-codeowners/ieee802154
-/components/esp_pm/ @esp-idf-codeowners/power-management @esp-idf-codeowners/bluetooth @esp-idf-codeowners/wifi
+/components/esp_pm/ @esp-idf-codeowners/power-management @esp-idf-codeowners/bluetooth @esp-idf-codeowners/wifi @esp-idf-codeowners/system
/components/esp_psram/ @esp-idf-codeowners/peripherals @esp-idf-codeowners/system
/components/esp_ringbuf/ @esp-idf-codeowners/system
/components/esp_rom/ @esp-idf-codeowners/system @esp-idf-codeowners/bluetooth @esp-idf-codeowners/wifi
