Move port_bit() to rtl837x_common.h as PORT_BIT(), a uint16_t shift,
and MAC_ADDR_LEN from rtl837x_lldp.h next to it, and use MAC_ADDR_LEN
for every address in the LACP code instead of a literal 6. Define
lacp_mux_update() before its first caller and drop the forward
declaration, declare variables at the top of their blocks, put the
operator at the end of a continued line, drop the field value comments
of the LACPDU struct, and leave lacp_port_lag to lacp_init() instead of
initialising it in the test environment.
The LACP test now compiles with the shared harness flags and
sdcc_shim.h against the firmware headers, so the copies under
test/lacp/shim are gone. test_port_tables already covers the trunk hash
seed that test/port_hash checked against its own register copies.
lacp_in() declares its locals at the top, which the stricter host build
needs.
d00f