NVIDIA: VR: SAUCE: Introduce full.config and full-64k.config

Introduce full.config and full-64k.config files:

- full.config: Full config (nvidia-6.17 + generic-6.18 new options, env
  excluded). Deduplicated so options already in nvidia.config are omitted.
  Merge with nvidia.config to build.

- full-64k.config: 64K page size variant of full.config. Same dedup rule.
  64K-related options taken from nvidia-6.17-64k reference (page size,
  PGTABLE_LEVELS, VA/PA bits, ARCH_MMAP_RND, etc.).

- nvidia.config: Add missing configs:
    CONFIG_ARM64_PSEUDO_NMI=y
    CONFIG_INIT_ON_ALLOC_DEFAULT_ON=n
    CONFIG_NVIDIA_TEGRA410_CMEM_LATENCY_PMU=m
    CONFIG_ARCH_TEGRA_241_SOC=y
    CONFIG_ARCH_FORCE_MAX_ORDER=13
    CONFIG_PAGE_BLOCK_MAX_ORDER=13

  Remove CONFIG_CMA_SIZE_MBYTES and let that be handled in the full
  configs, as its value differs according to page size.

- scripts/kconfig/merge_full_configs.py: Merges configs (first is base, later
  override/add), optional -d dedup fragment (omit from output any CONFIG_
  present in that file). Environment-related configs are excluded. The
  full.config and full-64k.config files were generated using this script:

    python3 ./scripts/kconfig/merge_full_configs.py               \
        -d ./arch/arm64/configs/nvidia.config                     \
        config-6.17.0-1008-nvidia config-6.18.0-9-generic         \
        -o ./arch/arm64/configs//full.config

    python3 ./scripts/kconfig/merge_full_configs.py               \
        -d ./arch/arm64/configs/nvidia.config                     \
        config-6.17.0-1008-nvidia-64k config-6.18.0-9-generic-64k \
        -o ./arch/arm64/configs//full-64k.config

Signed-off-by: Jamie Nguyen <jamien@nvidia.com>

Author: jamieNguyenNVIDIA