[U-Boot] of-platdata address map decode for 64-bits

[Kever Yang]

Hi Simon,

     For my rk3399(64bit) dts, the address is described as below:
#address-cells = <2>;
reg = <0x0 0xfe320000 0x0 0x4000>;

not like 32-bit soc which reg address describe like:
reg = <0xfe320000 0x4000>;

     There should have some update for this dts decode, right?
like:
map_sysmem()
regmap_init_mem_platdata()

     Do you have a idea to update all these kind of function call?
It will be very great if you can send a patch for it.

Thanks,
- Kever