[lc_ctrl,dv] Add an explicit "static" to a block-local variable
[lc_ctrl,dv] Add an explicit "static" to a block-local variable

It seems that Xcelium doesn't like processes to have local variables
that aren't explicitly marked as "static". Honestly, I'm not sure what
this achieves, but we may as well do so to shut up the warning.

Signed-off-by: Rupert Swarbrick <290093e2ad2515ed2f14d749293c8cf8e02ca274@lowrisc.org>

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