Merge branch 'sh_eth-complain-on-access-to-unimplemented-TSU-registers'

Sergei Shtylyov says:

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sh_eth: complain on access to unimplemented TSU registers

Here's a set of 2 patches against DaveM's 'net-next.git' repo. The 1st patch
routes TSU_POST<n> register accesses thru sh_eth_tsu_{read|write}() and the 2nd
added WARN_ON() unimplemented register to those functions. I'm going to deal with
TSU_ADR{H|L}<n> registers in a later series...
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Signed-off-by: David S. Miller <davem@davemloft.net>