i2c: mediatek: fixing the incorrect register offset

The reason for the modification here is that the previous
offset information is incorrect, OFFSET_DEBUGSTAT = 0xE4 is
the correct value.

Fixes: 25708278 ("i2c: mediatek: Add i2c support for MediaTek MT8183")
Signed-off-by: Kewei Xu <kewei.xu@mediatek.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Qii Wang <qii.wang@mediatek.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>