samsung: common: remove the duplicated stdio print message

Remove duplicated stdio print message.
It's already displayed in common/console.c.

Loading Environment from MMC... OK
In:    serial
Out:   serial
Err:   serial
Model: Odroid XU3/XU4/HC1/HC2 based on Exynos5422
Type:  xu3
In:    serial
Out:   serial
Err:   serial

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>