Remove redeclaration found by gcc build
These functions are also in ice_osdep.h and ice_nvm.h, where seems to be more
lwhsu on Aug 5 2020, 5:26 AM.Authored by
The latter nvm related functions can be removed immediately; these have been removed in a newer version of the driver.
ice_free_list() doesn't even appear to be defined, and I think it is ok to have the other functions declared/defined in ice_osdep.h instead of ice_common.h.
I'm not sure why they are there in ice_common.h.