Use hwreset_array in the Rockchip tsadc driver

The order of asserting/deasserting the resets doesn't matter so use
the new hwreset_array to manage them all.

Reviewed by: manu
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D37358

(cherry picked from commit 7ebc4c9bf76d1ea62e2ccd3020ff8e6e293b499c)