net: stmmac: rearrange stmmac_tx_info members to pack better

net: stmmac: rearrange stmmac_tx_info members to pack better

Rearrange the struct stmmac_tx_info members to pack better, essentially
by sorting by type size:

xsk_meta	embeds only a pointer - 32 or 64 bit
buf		dma address, 32 or 64 bit
len		normally 32 bit
buf_type	dependent on arch
map_as_page	normally 8 bit
last_segment	normally 8 bit
is_jumbo	normally 8 bit

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1w1LVo-0000000DGRl-44lt@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>