hwrng: pasemi_rng.c: Migrate to managed API

[PrasannaKumar Muralidharan]

> I didn't explain well, There is a CFE command 'show devtree' here's the
> relevant bits (I Hope)

This is much simple than I expected.

> [CFE ]CFE> show devtree
> [/]
>  | #interrupt-cells                 val   0x00000002
>  | #address-cells                   val   0x00000002
>  | #size-cells                      val   0x00000002
>
> ...[snip]...
>
>    [sdc at fc000000]
>     | name                          str   'sdc'
>     | device_type                   str   'sdc'
>     | #address-cells                val   0x00000001
>     | #size-cells                   val   0x00000001
>     | compatible                    str   '1682m-sdc' 'pasemi,pwrficient-sdc'
> 'pasemi,sdc'
>     | reg                           cell  00000000 FC000000 00000000 00800000
>
> ...[snip]...
>
>       [rng at fc105000]
>        | name                       str   'rng'
>        | device_type                str   'rng'
>        | compatible                 str   '1682m-rng' 'pasemi,pwrficient-rng'
> 'pasemi,rng'
>        | reg                        cell  FC105000 00001000
>

Device tree provided by CFE has the size. I will send another patch
which uses devm_ioremap_resource().

Appreciate your help. Thank you :).