Merge branch 'mlxsw-spectrum_router-Increase-VRF-scale'

Jiri Pirko says:

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mlxsw: spectrum_router: Increase VRF scale

Ido says:

The purpose of this set is to increase the maximum number of supported VRF
devices on top of the Spectrum ASIC under different workloads.

This is achieved by sharing the same LPM tree across all the virtual
routers for a given L3 protocol (IPv4 / IPv6). The change is explained in
detail in the third patch. First two patches are small changes to make
review easier.
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Signed-off-by: David S. Miller <davem@davemloft.net>