memory: tegra: make icc_set_bw return zero if BWMGR not supported

Return zero from icc_set_bw() to MC client driver if MRQ_BWMGR_INT
is not supported by the BPMP-FW. Currently, 'EINVAL' is returned
which causes error message in client drivers even when the platform
doesn't support scaling.

Fixes: 9365bf00 ("PCI: tegra194: Add interconnect support in Tegra234")
Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20230621134400.23070-5-sumitg@nvidia.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>