gpu: nvgpu: unit: add gr_prepare test

Add support gr_prepare for sw and hw.
Add needed registers using nvgpu_posix_io_add_reg_space calls.

Add unit tests covering following functions
nvgpu_gr_prepare_sw
nvgpu_gr_enable_hw

install-unit.sh modified to copy the firmware binaries under
nvgpu-unit/firmware directory

Currently the gr_init_prepare test is called as part of the
gr_config test, later this will be moved as separate unit test.

Jira NVGPU-3582
Bug 2693908

Change-Id: If8f5ac4988deba0db477b2177981f7912bdb8eec
Signed-off-by: vinodg <vinodg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2191254
GVS: Gerrit_Virtual_Submit
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

userspace/install-unit.sh

@@ -103,6 +103,7 @@ fi
 # Building the necessary directory structure. It may not be present
 # first time this is run.
 ssh $target mkdir -p nvgpu_unit/units
+ssh $target mkdir -p nvgpu_unit/firmware
 ssh $target mkdir -p $TOP/kernel
 if [ $? != 0 ]; then
     echo
@@ -121,6 +122,7 @@ jcp $TOP/kernel/nvgpu/userspace/gcov.sh                  nvgpu_unit/gcov.sh
 jcp $TOP/kernel/nvgpu/userspace/testlist.py              nvgpu_unit/testlist.py
 jcp $TOP/kernel/nvgpu/userspace/required_tests.json      \
 	nvgpu_unit/required_tests.json
+jcp $TOP/kernel/nvgpu/userspace/firmware/ nvgpu_unit/firmware/
 
 find $nvgpu_bins/userspace/units -name "*.so" -not -path "*unit.so" \
     -not -path "*drv.so" -exec ls {} \; | while read unit_so ; do