Revert "[rkpd_client] Add Error type to rkpd_client"

This reverts commit 2dbabf3b7232781d61faba97865a061b3bae5fd9.

Reason for revert: DroidMonitor revert for b/310139666

Bug: 310139666
Change-Id: I1213940cc4e3112038c1cc66f5a218a9378d6b0f
4 files changed