drm/amdgpu: partially revert powerplay `__counted_by` changes

Partially revert
commit 0ca9f757 ("drm/amd/pm: powerplay: Add `__counted_by` attribute for flexible arrays")

The count attribute for these arrays does not get set until
after the arrays are allocated and populated leading to false
UBSAN warnings.

Fixes: 0ca9f757 ("drm/amd/pm: powerplay: Add `__counted_by` attribute for flexible arrays")
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3662


Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 8a5ae927)
Cc: stable@vger.kernel.org