build form:
b2f397ce2c rk356x: ddr: add os reg version check
update feature:
1. Enable derate function for LPDDR4/LPDDR4x.
2. Add byte mode LPDDR4/4x support.
Note:
BL31 should be update to v2.14 or above.
Signed-off-by: Tang Yun ping <typ@rock-chips.com>
Change-Id: I5f5cc6db6b5b943167eb9181020966d0ae491f44
e8786aa0b9