drm/amd: Require CONFIG_HOTPLUG_PCI_PCIE for BOCO

If the kernel hasn't been compiled with PCIe hotplug support this
can lead to problems with dGPUs that use BOCO because they effectively
drop off the bus.

To prevent issues, disable BOCO support when compiled without PCIe hotplug.

Reported-by: Gabriel Marcano <gabemarcano@yahoo.com>
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/1707#note_2696862


Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://lore.kernel.org/r/20241211155601.3585256-1-superm1@kernel.org


Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 1ad5bdc2)