drm/amdgpu: add more device info to the devcoredump

Adding more device information:
a. PCI info
b. VRAM and GTT info
c. GDC config

Also correct the print layout and section information for
in devcoredump.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>