drm/amdgpu:cleanup ucode_init_bo

1,no sriov check since gpu recover is unified
2,need CPU_ACCESS_REQUIRED flag for VRAM if SRIOV
because otherwise after following PIN the first allocated
VRAM bo is wasted due to some TTM mgr reason.

Signed-off-by: Monk Liu <Monk.Liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>