LocalNet: remove buggy getIpv4MappedAddressBitLen()

(a) this function returns a constant

(b) this function is utterly misnamed/documented:

an ipv4 mapped address is (like any ipv6 address) 128 bits long

(c) there's not even a guarantee the address is v4 mapped
when it is called

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I35bd84d28feca080152fd0c3d8e7b22835698b38
1 file changed