drm/amdgpu/gfx7: Enable IP block soft reset as a GPU recovery method

Enable IP block soft reset as a GPU recovery method for GFX7
graphics and compute rings.

This improves current user experience on all GFX7 chips:

* On Kaveri and Kabini there is currently no working
  GPU recovery method so those chips currently require
  the user to manually reset the computer when there
  was a hang.

* On Hawaii and Bonaire, the current GPU recovery method
  always clears the contents of VRAM, which means that
  a buggy (hanging) app can crash the whole graphical
  session, which is less than ideal.

Using GFX IP block soft reset means that we can now
have a working recovery on GFX7 APUs and we can also
move on from GFX hangs on dGPUs without crashing the
whole system.

Tested with the "hard_reset_cp_wait" test case from the
Hang Test Suite created by Natalie Vock and Konstantin Seurer.
This Vulkan testcase waits for an event that never occurs,
effectively a WAIT_REG_MEM packet that intentionally hangs.
IP block soft reset can resolve that hang and allow
the rest of the system to move on and keep functioning
without needing a full ASIC reset.

Tested on the following chips:

Bonaire (Radeon HD 7790)
Hawaii (Radeon R9 390X)
Kaveri (A10-7850K)

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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