[ARM] 3474/1: S3C2440: USB rate writes wrong var to CLKDIVN

Patch from Ben Dooks

The wrong variable is written back to CLKDIVN
register if the USB PLL speed is above 94MHz

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>