net: ethernet: ti: Fix spelling mistake and clean up message

There is a spelling mistake in a dev_err message and the MAX_SKB_FRAGS
value does not need to be printed between parentheses. Fix this.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20220316233455.54541-1-colin.i.king@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>