mmc: renesas_sdhi: add eMMC HS400 mode support

This patch adds processing for selecting HS400 mode.

Signed-off-by: Masaharu Hayakawa <masaharu.hayakawa.ry@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
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v2 [Simon Horman]
* Updated to new version from BSP v3.6.0
* Dropped 4 and 8 tap differentiation as all SoCs currently supported
  by the driver in upstream use 4 taps for HS400.

v1 [Simon Horman]
* Combined patched by Ai Kyuse and Masaharu Hayakawa
* Rebase

v0 [Masaharu Hayakawa]
1 file changed