Few fixes for omaps against v4.5-rc3:

- Improve omap_device error message to tell driver writers what is
  wrong after commit 5de85b9d57ab ("PM / runtime: Re-init runtime PM
  states at probe error and driver unbind"). There will be also a
  handful of driver related fixes also queued separately. But adding
  this error message makes it easy to fix any omap_device using
  drivers suffering from this issue so I think it's important to
  have.

- Also related to commit 5de85b9d57ab discussion, let's fix a bug
  where disabling PM runtime via sysfs will also cause the hardware
  state to be different from PM runtime state.

- Fix audio clocks for beagle-x15.

- Use wakeup-source instead of gpio-key,wakeup for the new entries
  that sneaked in during the merge window.

- Fix a legacy booting vs device tree based booting regression for
  n900 where the legacy user space expects to have the device
  revision available in /proc/atags also when booted with device
  tree.

* tag 'omap-for-v4.5/fixes-rc3-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
  ARM: OMAP2+: Fix omap_device for module reload on PM runtime forbid
  ARM: OMAP2+: Improve omap_device error for driver writers
  ARM: DTS: am57xx-beagle-x15: Select SYS_CLK2 for audio clocks
  ARM: dts: am335x/am57xx: replace gpio-key,wakeup with wakeup-source property
  ARM: OMAP2+: Set system_rev from ATAGS for n900

Signed-off-by: Olof Johansson <olof@lixom.net>