drm/amdgpu: Fix type mismatch in amdgpu_gfx_kiq_init_ring

drm/amdgpu: Fix type mismatch in amdgpu_gfx_kiq_init_ring

This commit fixes a type mismatch in the amdgpu_gfx_kiq_init_ring
function triggered by the snprintf function expecting unsigned char
arguments due to the '%hhu' format specifier, but receiving int and u32
arguments.

The issue occurred because the arguments xcc_id, ring->me, ring->pipe,
and ring->queue were of type int and u32, not unsigned char. This led to
a type mismatch when these arguments were passed to snprintf.

To resolve this, the snprintf line was modified to cast these arguments
to unsigned char. This ensures that the arguments are of the correct
type for the '%hhu' format specifier and resolves the warning.

Fixes the below:
>> drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c:333:4: warning: format
>> specifies type 'unsigned char' but the argument has type 'int'
>> [-Wformat]
                    xcc_id, ring->me, ring->pipe, ring->queue);
                    ^~~~~~
>> drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c:333:12: warning: format
>> specifies type 'unsigned char' but the argument has type 'u32' (aka
>> 'unsigned int') [-Wformat]
                    xcc_id, ring->me, ring->pipe, ring->queue);
                            ^~~~~~~~
   drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c:333:22: warning: format specifies type 'unsigned char' but the argument has type 'u32' (aka 'unsigned int') [-Wformat]
                    xcc_id, ring->me, ring->pipe, ring->queue);
                                      ^~~~~~~~~~
   drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c:333:34: warning: format specifies type 'unsigned char' but the argument has type 'u32' (aka 'unsigned int') [-Wformat]
                    xcc_id, ring->me, ring->pipe, ring->queue);
                                                  ^~~~~~~~~~~
   4 warnings generated.

Fixes: 0ea554455542 ("drm/amdgpu: Fix snprintf usage in amdgpu_gfx_kiq_init_ring")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202405250446.XeaWe66u-lkp@intel.com/
Cc: Lijo Lazar <lijo.lazar@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>