SMDKV310: Fix undefined reference error

Fix buld error:
undefined reference to '__image_copy_end' and `save_boot_params'.

start.o: In function `_image_copy_end_ofs':
mmc_spl/board/samsung/smdkv310/start.S:44: undefined reference to `__image_copy_end'
start.o: In function `reset':
mmc_spl/board/samsung/smdkv310/start.S:137: undefined reference to `save_boot_params'

Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>