boards: amd: versalnet_rpu: Document PDI requirements for targets

[kedareswararao]

Fixes #94559

Clarify the different requirements for QEMU emulation versus real hardware deployment in the versalnet_rpu board documentation.

For QEMU target:

• XSDB (Xilinx System Debugger) is not used
• PDI (Programmable Device Image) is not required
• QEMU provides direct emulation without hardware initialization files

For real hardware target:

• XSDB and PDI file are required
• PDI contains the hardware initialization and boot configuration needed for the physical device

This documentation update helps users understand why PDI is optional for QEMU testing but mandatory for physical board deployment.

[yashi]

xsdb back-end isn't popular compare to openocd or jlink. I think it's better to add exact commands for both QEMU and a real hardware.

Just adding

west flash --pdi /path/to/your.pdi

or

west flash --context -r xsdb

helps a lot, I believe.

[kedareswararao]

xsdb back-end isn't popular compare to openocd or jlink. I think it's better to add exact commands for both QEMU and a real hardware.

Just adding

west flash --pdi /path/to/your.pdi

or

west flash --context -r xsdb

helps a lot, I believe.

Updated as suggested please review.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud