net: liquidio: Remove unused declarations

Commit da15c78b ("liquidio CN23XX: VF register access") declared
cn23xx_dump_vf_initialized_regs() but never implemented it.

octeon_dump_soft_command() is never implemented and used since introduction in
commit 35878618 ("liquidio: Added delayed work for periodically updating
the link statistics.").

And finally, a few other declarations were never implenmented since introduction
in commit f21fb3ed ("Add support of Cavium Liquidio ethernet adapters").

Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240824083107.3639602-1-yuehaibing@huawei.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>