dt-bindings: mfd: rk817: Merge support for RK809

dt-bindings: mfd: rk817: Merge support for RK809

The Rockchip RK809 PMIC is compatible with RK817 and provides the same
capabilities, except for the battery charger manager.

There are also minor regulator related differences: BOOST and OTG_SWITCH
are specific to RK817, while DCDC_REG5, SWITCH_REG1 and SWITCH_REG2 are
provided RK809.

The current binding for RK809 doesn't document the audio codec
properties, although it has been already in use by several boards:
rk3566-quartz64-b, k3566-roc-pc, rk3568-evb1-v10, rk3568-lubancat-2,
rk3568-odroid-m1, rk3568-rock-3a.

Therefore dtbs_check fails for all of them:

  DTC_CHK arch/arm64/boot/dts/rockchip/rk3568-rock-3a.dtb
  rk3568-rock-3a.dtb: pmic@20: '#sound-dai-cells', 'assigned-clock-parents', 'assigned-clocks', 'clock-names', 'clocks', 'codec' do not match any of the regexes: 'pinctrl-[0-9]+'
    from schema $id: http://devicetree.org/schemas/mfd/rockchip,rk809.yaml#

Additionally, the example in rockchip,rk809 binding is not able to
actually test the schema since it uses a wrong compatible
'rockchip,rk808' instead of the expected 'rockchip,rk809'.

Instead of duplicating even more content, merge the RK809 support into
the more inclusive RK817 schema and drop the now obsolete rockchip,rk809
related file.

Fixes: 6c38ca03406e ("dt-bindings: mfd: rk808: Convert bindings to yaml")
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240622-rk809-fixes-v2-2-c0db420d3639@collabora.com
Signed-off-by: Lee Jones <lee@kernel.org>