drm/amdgpu: Clean up errors in navi12_ip_offset.h

Fix the following errors reported by checkpatch:

ERROR: open brace '{' following struct go on the same line

Signed-off-by: chenxuebing <chenxb_99091@126.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drm/amd/include/navi12_ip_offset: Mark top-level IP_BASE as __maybe_unused

Fixes the following W=1 kernel build warning(s):

In file included from drivers/gpu/drm/amd/amdgpu/navi12_reg_init.c:27:
drivers/gpu/drm/amd/amdgpu/../include/navi12_ip_offset.h:179:29: warning: ‘USB0_BASE’ defined but not used [-Wunused-const-variable=]
179 | static const struct IP_BASE USB0_BASE ={ { { { 0x0242A800, 0x05B00000, 0, 0, 0 } },
| ^~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../include/navi12_ip_offset.h:172:29: warning: ‘UMC_BASE’ defined but not used [-Wunused-const-variable=]
172 | static const struct IP_BASE UMC_BASE ={ { { { 0x00014000, 0x02425800, 0, 0, 0 } },
| ^~~~~~~~
drivers/gpu/drm/amd/amdgpu/../include/navi12_ip_offset.h:151:29: warning: ‘SDMA_BASE’ defined but not used [-Wunused-const-variable=]
151 | static const struct IP_BASE SDMA_BASE ={ { { { 0x00001260, 0x0000A000, 0x02402C00, 0, 0 } },
| ^~~~~~~~~

NB: Snipped a few of these

Acked-by: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drm/amdgpu: Fix a typo in the include header guard of 'navi12_ip_offset.h'

'_navi10_ip_offset_HEADER' is already used in 'navi10_ip_offset.h', so use
'_navi12_ip_offset_HEADER' instead here.

Reviewed-by: Xiaojie Yuan <xiaojie.yuan@amd.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drm/amdgpu: add ip offset header for navi12 (v2)

This adds the absolute offsets of each IP regiser block.

v2: Squash in MP1 update

Signed-off-by: Xiaojie Yuan <xiaojie.yuan@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>