Break out patches from RT monolithic printk update
    - serial: 8250: lock port for omap8250_restore_regs() (bsc#1214683
      (PREEMPT_RT prerequisite backports)).
    - serial: 8250: lock port for rx_dma() callback (bsc#1214683
      (PREEMPT_RT prerequisite backports)).
    - serial: 8250: omap: convert to modern PM ops (bsc#1214683
      (PREEMPT_RT prerequisite backports)).
    - serial: 8250_mtk: Simplify clock sequencing and runtime PM
      (bsc#1214683 (PREEMPT_RT prerequisite backports)).
    - serial: arc_uart: simplify flags handling in
      arc_serial_rx_chars() (bsc#1214683 (PREEMPT_RT prerequisite
      backports)).
    - serial: drivers: switch ch and flag to u8 (bsc#1214683
      (PREEMPT_RT prerequisite backports)).
    - serial: exar: Add RS-485 support for Sealevel XR17V35X based
      cards (bsc#1214683 (PREEMPT_RT prerequisite backports)).
    - serial: omap-serial: remove flag from serial_omap_rdi()
      (bsc#1214683 (PREEMPT_RT prerequisite backports)).
    - tty: Explicitly include correct DT includes (bsc#1214683
      (PREEMPT_RT prerequisite backports)).
    - printk: Keep non-panic-CPUs out of console lock (bsc#1214683
      (PREEMPT_RT prerequisite backports)).
    - printk: Reduce console_unblank() usage in unsafe scenarios
      (bsc#1214683 (PREEMPT_RT prerequisite backports)).
    - Refresh
      patches.suse/printk-Monolithic-bring-printk-up-to-date-with-v6.6-rt25.patch.