net: ena: Move XDP code to its new files

net: ena: Move XDP code to its new files

[ Upstream commit d000574d02870710c62751148cbfe22993222b98 ]

XDP system has a very large footprint in the driver's overall code.
makes the whole driver's code much harder to read.

Moving XDP code to dedicated files.

This patch doesn't make any changes to the code itself and only
cut-pastes the code into ena_xdp.c and ena_xdp.h files so the change
is purely cosmetic.

Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: David Arinzon <darinzon@amazon.com>
Link: https://lore.kernel.org/r/20240101190855.18739-2-darinzon@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 36a1ca01f045 ("net: ena: Set tx_info->xdpf value to NULL")
Signed-off-by: Sasha Levin <sashal@kernel.org>