hwreset: fix clk_id type

[br]

Summary

The ID is passed as intptr_t everywhere except this place.
This is needed for Premier P550 that features 2 reset cells (unusually)

[jrtc27]

Honestly we should instead be removing the use of intptr_t for hwreset, it's not a sensible type to use for an ID.

[mhorne]

In D47854#1090987, @jrtc27 wrote:

Honestly we should instead be removing the use of intptr_t for hwreset, it's not a sensible type to use for an ID.

I agree, it should be converted to a long.

This commit is still correct as-is.