Revert "pinctrl: move subsystem mutex to pinctrl_dev struct"

This reverts commit 42fed7ba44e4e8c1fb27b28ad14490cb1daff3c7.
Revert "net/macb: clear tx/rx completion flags in ISR"

This reverts commit 749a2b66f49de322ae472d57e1451e5f623d82f1.