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Very rarely, LPDDR4 power consumption may not decrease
In self-refresh mode.

This patch fixes the DBSC4 self-refresh mode sequence.
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Signed-off-by: Kenji Miyazawa <kenji.miyazawa.xt@renesas.com>
Signed-off-by: Chiaki Fujii <chiaki.fujii.wj@renesas.com>
Change-Id: I838fa0892b1caf1ecd3f04538b3427e7d971ef59