rnndb: Add FECS_CURRENT_CTX and FECS_NEW_CTX
Source (nvgpu):
- 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#l989
<reg32 offset="0x8b0" name="BLCG1" variants="GK104-"/>
+ <reg32 offset="0xb00" name="CURRENT_CTX" variants="GM107-">
+ <bitfield low="0" high="29" name="CHAN" type="g80_channel"/>
+ <bitfield pos="31" name="VALID" type="boolean"/>
+ </reg32>
+ <reg32 offset="0xb04" name="NEW_CTX" variants="GM107-">
+ <bitfield low="0" high="29" name="CHAN" type="g80_channel"/>
+ <bitfield pos="31" name="VALID" type="boolean"/>
+ </reg32>
+
<reg32 offset="0xc00" name="ENGINE_STATUS">
<bitfield pos="0" name="CHSW_PENDING"/>
<bitfield pos="1" name="CHAN_VALID"/>
