ARM: davinci: da8xx: Remove legacy USB and SATA clock init

This removes the unused legacy USB and SATA clock init code from
arch/arm/mach-davinci/{devices,usb}-da8xx}.c.

Signed-off-by: David Lechner <david@lechnology.com>
Reviewed-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>