staging: r8188eu: make rtl8188e_process_phy_info static

rtl8188e_process_phy_info is used only in rtl8188e_rxdesc.c. Make the
function static and remove its prototype from rtl8188e_recv.h.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220315205041.2714168-5-martin@kaiser.cx


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>