ETH_P_LLDP missing from linux-like constants

[sakars]

Currentlly I could not find ETH_P_LLDP which should be 0x88cc in src/unix/linux_like/linux/mod.rs nor src/unix/linux_like/android/mod.rs

As it is defined in:
https://github.com/torvalds/linux/blob/45c13f3f9e3bb15fd89ff2864c6f627a3b4b4229/include/uapi/linux/if_ether.h#L101