gpu: nvgpu: split gk20a_submit_append_gpfifo

In gk20a_submit_channel_gpfifo the gpfifo entries can come from a kernel
buffer or from userspace. To simplify the logic in
gk20a_submit_append_gpfifo, extract out a function that copies the
entries directly from userspace to the gpu memory for performance, and
another function that copies from a kernel buffer to the gpu memory. The
latter is used for kernel submits and when the gpfifo pipe exists which
would mean that the gpfifo memory is in vidmem and is thus not directly
accessible with a kernel virtual pointer.

While this function is being changed a lot, also rename it to start with
nvgpu_ instead of gk20a_.

Additionally, simplify pushbuffer debug tracing by always using the
kernel memory for the prints. Tracing when the gpfifo memory has been
allocated in vidmem is no longer supported; sysmem is almost always used
in practice anyway.

Jira NVGPU-705

Change-Id: Icab843a379a75fb46054dee157a0a54ff9fbba59
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1730481
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

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