arm64: dts: amlogic: meson-g12b-radxa-zero2: fix pwm clock names

Fixes the following bindings check error:
- pwm@2000: clock-names: 'oneOf' conditional failed, one must be fixed:
['clkin4'] is too short
'clkin4' is not one of ['clkin0', 'clkin1']
'clkin0' was expected
- pwm@7000: clock-names: 'oneOf' conditional failed, one must be fixed:
['clkin3'] is too short
'clkin3' is not one of ['clkin0', 'clkin1']
'clkin0' was expected
- pwm@19000: clock-names: 'oneOf' conditional failed, one must be fixed:
['clkin2'] is too short
'clkin2' is not one of ['clkin0', 'clkin1']
'clkin0' was expected

Fixes: d747e7f76a5f ("arm64: dts: meson: add support for Radxa Zero2")
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20230207-b4-amlogic-bindings-fixups-v2-v1-4-93b7e50286e7@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

arm64: dts: meson: add support for Radxa Zero2

Radxa Zero2 is a small form factor SBC based on the Amlogic A311D
chipset that ships in a number of eMMC configurations:

- Amlogic A311D (Quad A73 + Dual A53) CPU
- 4GB LPDDR4 RAM
- 32/64/128GB eMMC
- Mali G52-MP4 GPU
- HDMI 2.1 output (micro)
- BCM4345 WiFi (2.4/5GHz a/b/g/n/ac) and BT 5.0
- 1x USB 2.0 port - Type C (OTG)
- 1x USB 3.0 port - Type C (Host)
- 1x micro SD Card slot
- 40 Pin GPIO header

Signed-off-by: Yuntian Zhang <yt@radxa.com>
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20230127150536.3719090-2-christianshewitt@gmail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>