memory: tegra: Add dummy implementation on Tegra194

With the introduction of commit 9365bf006f53 ("PCI: tegra194: Add
interconnect support in Tegra234"), the PCI driver on Tegra194 and later
requires an interconnect provider. However, a provider is currently only
exposed on Tegra234 and this causes PCI on Tegra194 to defer probe
indefinitely.

Fix this by adding a dummy implementation on Tegra194. This allows nodes
to be provided to interconnect consumers, but doesn't do any bandwidth
accounting or frequency scaling.

Fixes: 9365bf006f53 ("PCI: tegra194: Add interconnect support in Tegra234")
Reported-by: Jon Hunter <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>
Reviewed-by: Sumit Gupta <[email protected]>
Tested-by: Sumit Gupta <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Krzysztof Kozlowski <[email protected]>

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