drm/panthor: Add GPU register definitions

Those are the registers directly accessible through the MMIO range.

FW registers are exposed in panthor_fw.h.

v6:
- Add Maxime's and Heiko's acks

v4:
- Add the CORE_FEATURES register (needed for GPU variants)
- Add Steve's R-b

v3:
- Add macros to extract GPU ID info
- Formatting changes
- Remove AS_TRANSCFG_ADRMODE_LEGACY - it doesn't exist post-CSF
- Remove CSF_GPU_LATEST_FLUSH_ID_DEFAULT
- Add GPU_L2_FEATURES_LINE_SIZE for extracting the GPU cache line size

Co-developed-by: Steven Price <[email protected]>
Signed-off-by: Steven Price <[email protected]>
Signed-off-by: Boris Brezillon <[email protected]>
Acked-by: Steven Price <[email protected]> # MIT+GPL2 relicensing,Arm
Acked-by: Grant Likely <[email protected]> # MIT+GPL2 relicensing,Linaro
Acked-by: Boris Brezillon <[email protected]> # MIT+GPL2 relicensing,Collabora
Reviewed-by: Steven Price <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Acked-by: Heiko Stuebner <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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