test: build the LACP test on the real headers, drop the port_hash test

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.

test/README.md

@@ -48,8 +48,7 @@ fires — so it drops straight into CI.
 | `test_port_tables` | `rtl837x_port.c` | VLAN entry layout and round trip, PVID register sharing, static multicast and management entries, per-port flush, trunk membership and hash seed |
 | `test_page_json` | `httpd/page_impl.c` + `rtl837x_port.c` | `/vlan.json`, `/vlanlist`, `/l2.json` (walk, wrap marker, paging inside `outbuf`), 64-bit counters in `/status.json` and `/counters.json` |
 | `test_httpd_tx` | `httpd/httpd.c` + `uip/uip.c` | a GET of a static file against a client that moves its receive window: ACK accounting, continuation chunks out of flash, retransmission |
-| `lacp/` | `rtl837x_lacp.c` | state machines against a simulated 802.3ad partner: convergence, mis-cabling, expiry, re-election, two groups, LACPDU containment entries |
-| `port_hash/` | `port_lag_members_set()` | a LAG seeds its own hash register |
+| `test_lacp` | `rtl837x_lacp.c` | state machines against a simulated 802.3ad partner: convergence, mis-cabling, expiry, re-election, two groups, delivery by trap |
 
 ## Adding a test for another module
 1. Write `test_<module>.c` with `main()` driving the module's entry points and