the Exynos4210 devices in u-boot uses samsung,exynos4412-sdhci as
sdhci compatible in their DTSes, while the upstream DTSes uses
samsung,exynos4210-sdhci.
Add samsung,exynos4210-sdhci compatible string for s5p_sdhci driver as
well so that it can be used with upstream DTSes.
Signed-off-by: Henrik Grimler <henrik@grimler.se> Reviewed-by: Anand Moon <linux.amoon@gmail.com> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Peng Fan <peng.fan@nxp.com>