We specify clock-frequency manually, so that eSDHC will work without
upgrading U-Boot.  Though, that'll only work for default setup (1500 MHz)
on new board revisions.  For non-default setups, it's recommended to
upgrade U-Boot, since it will fixup clock-frequency automatically.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: Pierre Ossman <pierre@ossman.eu>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: David Vrabel <david.vrabel@csr.com>
Cc: Ben Dooks <ben@fluff.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>