mmc: xenon_sdhci: Add missing host->max_clk to Xenon SDHCI driver

mmc: xenon_sdhci: Add missing host->max_clk to Xenon SDHCI driver

The Xenon SDHCI driver just missed the integration of this patch:

git ID 6d0e34bf
mmc: sdhci: Distinguish between base clock and maximum peripheral frequency

With this patch applied, the SDHCI subsystem complains now with this warning
while probing:

sdhci_setup_cfg: Hardware doesn't specify base clock frequency

This patch fixes this issue, by providing the missing host->max_clk
variable to the SDHCI subsystem.

Signed-off-by: Stefan Roese <[email protected]>
Cc: Hu Ziji <[email protected]>
Cc: Victor Gu <[email protected]>
Cc: Konstantin Porotchkin <[email protected]>
Cc: Nadav Haklai <[email protected]>
Cc: Stefan Herbrechtsmeier <[email protected]>
Cc: Jaehoon Chung <[email protected]>