[U-Boot] [PATCH 5/5:q i2c: made unused function i2c_mux_add_device static

[Frans Meulenbroeks]

Apologies, apparently accidently mangled the command line.
(actually there was an unrelated patch inbetween, so edited the
subject line after creating the patch, and goofed.
Guess you all know now what editor I'm using.
Patch does apply.

Frans