rockchip: sdram: the enum of DDR type move to sdram_common.h

Change-Id: I62877384b6f0ee232e9765143b3deea2c5693a36
Signed-off-by: YouMin Chen <cym@rock-chips.com>

rockchip: rk322x: add sdram driver

Add driver for rk322x to support sdram initialize in SPL.

Series-version: 3
Series-changes: 3
- move rk332x sdram driver to driver/ram
- do the ram init in TPL in

rockchip: rk322x: add sdram driver

Add driver for rk322x to support sdram initialize in SPL.

Series-version: 3
Series-changes: 3
- move rk332x sdram driver to driver/ram
- do the ram init in TPL instad of SPL

Change-Id: I44f5fed275d65e7758efd38f1a5124a8d9698a7d
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

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