uboot-imx

board: atmel: siemens: clean up UTMI PLL code

Due to introducing the new UTMI PLL clock handle functions,
use the functions to reduce the duplicated code.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Tested-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Andreas Bießmann <andreas.devel@googlemail.com>