struct tmio_mmc_host has "scc_tappos", but in fact, it is Renesas
private data.  Move it to renesas_sdhi.h
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: NWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>