Due to the introduction of the pinctrl and clk driver, and using
device tree files, remove the unneeded hardcoded pin configuration
and clock enabling code from the board file.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Remove CONFIG_PHY_MICREL as per previous patch:
Signed-off-by: Simon Glass <sjg@chromium.org>