ac: resolve conflicts introduced with "ac: remove amdgpu.h dependency"

ac: resolve conflicts introduced with "ac: remove amdgpu.h dependency"

The commit did not add the relevant includes - in particular
stdint.h and stdbool.h for the respective standard types.

At the same time, the amdgpu_device_handle typedef redeclaration was
off.

Fixes: 81945ded0dc ("ac: remove amdgpu.h dependency")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101471
Cc: Mark Janes <mark.a.janes@intel.com>
Cc: Gregor Münch <gr.muench@gmail.com>
Reported-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reported-by: Mark Janes <mark.a.janes@intel.com>
Reported-by: Gregor Münch <gr.muench@gmail.com>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Tested-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>