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