arm64: dts: qcom: qcs8550: add QCS8550 RB5Gen2 board support

The RB5gen2 is an embedded development platform for the
QCS8550, based on the Snapdragon 8 Gen 2 SoC (SM8550).

This change implements the main board, the vision mezzanine
will be supported in a follow up patch.

The main board has the following features:
- Qualcomm Dragonwing QCS8550 SoC
- Adreno GPU 740
- Spectra ISP
- Adreno VPU 8550
- Adreno DPU 1295
- 1 x 1GbE Ethernet (USB Ethernet)
- WIFI 7 + Bluetooth 5.4
- 1 x USB 2.0 Micro B (Debug)
- 1 x USB 3.0 Type C (ADB, DP out)
- 2 x USB 3.0 Type A
- 1 x HDMI 1.4 Type A
- 1 x DP 1.4 Type C
- 2 x WSA8845 Speaker amplifiers
- 2 x Speaker connectors
- 1 x On Board PDM MIC
- Accelerometer + Gyro Sensor
- 96Boards compatible low-speed and high-speed connectors [1]
- 7 x LED indicators (4 user, 2 radio, 1 power)
- Buttons for power, volume up/down, force USB boot
- 3 x Dip switches

On-Board PMICs:
- PMK8550 2.1
- PM8550 2.0
- PM8550VS 2.0 x4
- PM8550VE 2.0
- PM8550B 2.0
- PMR735D 2.0
- PM8010 1.1 x2

Product Page: [2]

[1] https://www.96boards.org/specifications/
[2] https://www.thundercomm.com/product/qualcomm-rb5-gen-2-development-kit

The default msi-map from sm8550.dtsi is deleted for both pcie0 and
pcie1. The QPS615 PCIe switch on each port exposes more than two
devices (1 USP + 3 DSPs), but Gunyah currently limits ITS device
mappings to two per root complex to save memory. With msi-map
present, the ITS MAPD command times out.

Deleting msi-map causes the DWC controller to fall back to its
internal iMSI-RX module, which handles MSIs without this limitation.

Signed-off-by: Joe Sandom <jsandom@axon.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260420-rb5gen2-dts-v4-5-b461909c2de8@axon.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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