firmware: tegra: Fix IVC dependency problems

firmware: tegra: Fix IVC dependency problems

[ Upstream commit 78eb18020a88a4eed15f5af7700ed570642ff8f1 ]

The IVC code is library code that other drivers need to select if they
need that library. However, if the symbol is user-selectable this can
lead to conflicts.

Fix this by making the symbol only selectable for COMPILE_TEST and add
a select TEGRA_IVC to TEGRA_BPMP, which is currently the only user.

Link: https://lore.kernel.org/r/20250506133118.1011777-10-thierry.reding@gmail.com
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>