libcoexist.a directly references phy_coex_force_rx_ant and
phy_coex_dismiss_rx_ant from libphy.a (esp_phy component) but never
declared this dependency. It only worked because esp_common privately
linked esp_wifi (which transitively brings esp_phy) with
LINK_INTERFACE_MULTIPLICITY 4, causing libphy.a to repeat in the link
line. An upcoming esp_common change removes that mechanism, exposing
this missing dependency.