exynos: Drop large alignment for SDRAM parameters

We don't ever search for these so there is no need for a 4KB alignment.
It just wastes space.

Drop this and use the standard 4-byte alignment.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>