net: sh-eth: Fix typo from rESR_RTLF to EESR_RTLF

'r' of rESR_RTLF is a mistake of E.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>