uboot-imx

mvsata: issue hard reset on initialization

Before the actual initialization do a hard reset of the SATA port and the
connected device.

changes v1->v2:
 - add comment for udelay

Signed-off-by: Michael Walle <michael@walle.cc>
Cc: Prafulla Wadaskar <prafulla@marvell.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>