rnndb: Add FECS.CTXSW.MAJOR_REV_ID
rnndb: Add FECS.CTXSW.MAJOR_REV_ID

Hardware-stored major revision ID for firmware.

Source:
- https://nv-tegra.nvidia.com/gitweb/?p=linux-nvgpu.git;a=blob;f=drivers/gpu/nvgpu/include/nvgpu/hw/gp10b/hw_gr_gp10b.h;hb=refs/tags/tegra-l4t-r28.2#l1253

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