i40e: Remove unused i40e_blink_phy_link_led

i40e_blink_phy_link_led() was added in 2016 by
commit fd077cd3 ("i40e: Add functions to blink led on 10GBaseT PHY")

but hasn't been used.

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://patch.msgid.link/20250102173717.200359-3-linux@treblig.org


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