drm/amdkfd: remove unused sq_int_priv variable

clang with W=1 reports
drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_int_process_v11.c:282:38: error: variable
  'sq_int_priv' set but not used [-Werror,-Wunused-but-set-variable]
        uint8_t sq_int_enc, sq_int_errtype, sq_int_priv;
                                            ^
This variable is not used so remove it.

Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>