drm/amdgpu: release gpu full access after "amdgpu_device_ip_late_init"

[WHY]
 Function "amdgpu_irq_update()" called by "amdgpu_device_ip_late_init()" is an atomic context.
 We shouldn't access registers through KIQ since "msleep()" may be called in "amdgpu_kiq_rreg()".

[HOW]
 Move function "amdgpu_virt_release_full_gpu()" after function "amdgpu_device_ip_late_init()",
 to ensure that registers be accessed through RLCG instead of KIQ.

Call Trace:
  <TASK>
  show_stack+0x52/0x69
  dump_stack_lvl+0x49/0x6d
  dump_stack+0x10/0x18
  __schedule_bug.cold+0x4f/0x6b
  __schedule+0x473/0x5d0
  ? __wake_up_klogd.part.0+0x40/0x70
  ? vprintk_emit+0xbe/0x1f0
  schedule+0x68/0x110
  schedule_timeout+0x87/0x160
  ? timer_migration_handler+0xa0/0xa0
  msleep+0x2d/0x50
  amdgpu_kiq_rreg+0x18d/0x1f0 [amdgpu]
  amdgpu_device_rreg.part.0+0x59/0xd0 [amdgpu]
  amdgpu_device_rreg+0x3a/0x50 [amdgpu]
  amdgpu_sriov_rreg+0x3c/0xb0 [amdgpu]
  gfx_v10_0_set_gfx_eop_interrupt_state.constprop.0+0x16c/0x190 [amdgpu]
  gfx_v10_0_set_eop_interrupt_state+0xa5/0xb0 [amdgpu]
  amdgpu_irq_update+0x53/0x80 [amdgpu]
  amdgpu_irq_get+0x7c/0xb0 [amdgpu]
  amdgpu_fence_driver_hw_init+0x58/0x90 [amdgpu]
  amdgpu_device_init.cold+0x16b7/0x2022 [amdgpu]

Signed-off-by: Chong Li <[email protected]>
Reviewed-by: [email protected]

Author: Chong Li