Add common files to POSIX build, and enable most of the common feature
flags nvgpu has enabled in other builds.
As consequence common code now uses more APIs that need to be stubbed
in POSIX build, so add stubs posix-dt.c, posix-nvhost.c, posix-vgpu.c,
and posix-vidmem.c.
JIRA NVGPU-1734
Change-Id: I936c5886229cb4d47cab4f42b013ff77f9e45482
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1993127
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
