drm/loongson: Error out if no VRAM detected

When a Loongson laptop is equipped with a Radeon GPU, it can be true that
there is no dedicated VRAM soldered on the motherboard. This is probably
for cost reason, but drm/loongson driver is probed because the platform
BIOS (either UEFI or PMON) forget to disable the integrated GPU.

So in the lsdc_get_dedicated_vram() function, we error out if no dedicated
VRAM detected. This fix nothing, but serve as a sanity check only.

Tested-by: Xiaotian Wu <[email protected]>
Signed-off-by: Huacai Chen <[email protected]>
Reviewed-by: Sui Jingfeng <[email protected]>
Signed-off-by: Sui Jingfeng <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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