update Imx93 build to scarthgap 6.6.52

[swegener-rtp]

Summary

Updates the FRDM-i.MX93 development image to the NXP 6.6.52 BSP baseline and also repairs the inherited conformance-platform submodule mappings in the root repository metadata.

Changes

• Updates the NXP BSP layers to the 6.6.52-2.2.2 revisions
• Updates Linux to 6.6.52
• Updates U-Boot and TF-A to the matching NXP release revisions
• Adds meta-imx/meta-imx-bsp
• Refreshes the FRDM U-Boot patch without changing its behavior
• Moved the inherited nxp-conformance-yocto submodule mappings into the root .gitmodules

Validation

• BitBake parse passed
• kernel_configcheck passed
• virtual/kernel build passed
• Full image build passed with all 13,568 tasks succeeding
• git diff --check passed
• git submodule sync --recursive passed
• git submodule status --recursive passed

Artifact

• Compressed SHA-256: 11aa46ed62e0cc122324da9dc607f260f3e830ffade6dd36b493440f1ffb9550
• Raw SHA-256: ef623b778070856bb4cc7cfb29c9c03fd970d132d45015009e775f14868b76d6
• Raw size: 15,309,209,600 bytes
• Partition layout remains 256 MiB / 8192 MiB / 6144 MiB