net: ti: icssg-prueth: Fix memory leak in XDP_DROP for non-zero-copy mode

In the Linux kernel, the following vulnerability has been resolved:

net: ti: icssg-prueth: Fix memory leak in XDP_DROP for non-zero-copy mode

Page recycling was removed from the XDP_DROP path in emac_run_xdp() to

avoid conflicts with AF_XDP zero-copy mode, which uses xsk_buff_free()

instead.

However, this causes a memory leak when running XDP programs that drop

packets in non-zero-copy mode (standard page pool mode). The pages are

never returned to the page pool, leading to OOM conditions.

Fix this by handling cleanup in the caller, emac_rx_packet().

When emac_run_xdp() returns ICSSG_XDP_CONSUMED for XDP_DROP, the

caller now recycles the page back to the page pool. The zero-copy

path, emac_rx_packet_zc() already handles cleanup correctly with

xsk_buff_free().