net: dwc-xlgmac: Fix spelling mistake in function name

There is a spelling mistake in the function name alloc_channles_and_rings.
Fix this by renaming it to alloc_channels_and_rings.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210204094944.51460-1-colin.king@canonical.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>