Revert "Use process_vm_readv to read memory."

This reverts commit 279843e1397aff2aedb5e5ffe513893fa1f6767f.

Bug: 32806783

Change-Id: I61df26d979a8139a571ff5a6442fb5499ca20547
Test: Verified that the stack and read data works with the revert.
1 file changed