Fix rocminfo when run within docker environments.

[iotamudelta]

Currently, rocminfo will fail when executed inside a docker container
due to being unable to lsmod inside docker. This has impacts on rocprofiler use.

Fix this behavior by querying initstate of the amdgpu module from
/sys/module/amdgpu instead. If initstate is marked "live" everything is
fine - error out with either "not loaded" (initstate file does not
exist) or "not live" (initstate file does not contain "live" string).

[Maxzor]

Can someone review this please? LGTM, and the current check is pretty dumb.
This is cumbersome, had to do all kinds of wizardry to bypass that.
You could add checks:

• that /dev/dri and /dev/kfd are mounted
• that the current user belongs to render&video groups too to prevent "false positives".
  Meaning, rocminfo succeeds while further programs above in the stack won't work.

[dayatsin-amd]

Looks good to me. I will submit the patch from our internal repo

[susman]

Querying /sys/module/amdgpu/initstate isn't a good solution either. It doesn't work on systems with the module built-in.
One suggestion would be to look for 0x1002 in /sys/class/drm/card*/device/vendor