net: thunderx: Remove unused declarations

Commit 4863dea3 ("net: Adding support for Cavium ThunderX network
controller") declared nicvf_qset_reg_{write,read}() but never implemented.

Commit 4863dea3 ("net: Adding support for Cavium ThunderX network
controller") declared bgx_add_dmac_addr() but no implementation.

After commit 5fc7cf17 ("net: thunderx: Cleanup PHY probing code.")
octeon_mdiobus_force_mod_depencency() is not used any more.

Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240824082754.3637963-1-yuehaibing@huawei.com


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