gpu: nvgpu: enable platform atomic feature

Support following changes related to platform atomic feature
NV_PFB_PRI_MMU_CTRL_ATOMIC_CAPABILITY_MODE to RMW MODE
NV_PFB_PRI_MMU_CTRL_ATOMIC_CAPABILITY_SYS_NCOH_MODE to L2
NV_PFB_HSHUB_NUM_ACTIVE_LTCS_HUB_SYS_ATOMIC_MODE to USE_RMW
NV_PFB_FBHUB_NUM_ACTIVE_LTCS_HUB_SYS_ATOMIC_MODE to USE_RMW
NV_PFB_FBHUB_NUM_ACTIVE_LTCS_HUB_SYS_NCOH_ATOMIC_MODE to USE_READ

In gv11b, FBHUB_NUM_ACTIVE_LTCS register has read only privilege,
so atomic mode register bits cannot be updated from kernel code.

atomic capability and atomic_sys_ncoh_mode bits are copied from
fb mmu_ctrl to gpcs_mmu_ctrl register.

new tu104 hal for fb_enable_nvlink function.

bug 200580236

Change-Id: Ia78986c1c56795c6efad20f4ba42700ef1c2c1ad
Signed-off-by: Vinod G <vinodg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2013481
(cherry picked from commit 251e3eaa8029c4ae07b2cde7af5d9775e1cd8ec1)
Signed-off-by: Lakshmanan M <lm@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2274932
GVS: Gerrit_Virtual_Submit
Tested-by: Sreeniketh H <sh@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

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