driver: ram: rockchip: px30: dram init select common code

Change-Id: I4f01c354355d61884f84bad160a54db927bb72cf
Signed-off-by: YouMin Chen <cym@rock-chips.com>

driver: ram: rockhip: px30: fix auto power down issue

1.The recommends value of dfi_tlp_resp is 7.
2.Set PHY_REG07[7] to 1 for off digit module clock when enter power down.
3.Force set DDR3 or DDR4

driver: ram: rockhip: px30: fix auto power down issue

1.The recommends value of dfi_tlp_resp is 7.
2.Set PHY_REG07[7] to 1 for off digit module clock when enter power down.
3.Force set DDR3 or DDR4 active_ranks to 3 to workaround the issue of
gate memory clock when enter power down.

Change-Id: Iea4dd5554a7c527053c91ab7bd0a9db8c8223b59
Signed-off-by: YouMin Chen <cym@rock-chips.com>

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drivers: ram: rockchip: add px30 sdram init code

Change-Id: Ia7496d062d3041e22f26cb9ee91e72f6f463cde5
Signed-off-by: YouMin Chen <cym@rock-chips.com>