Revert "[PATCH 2/2] staging: etnaviv: add an offset for buffer dumping"

This reverts commit eb76fdcb8ce31516274347f589ad507d8306be85.
Revert "PATCH 1/2] staging: etnaviv: respect the submission command offset"

This reverts commit 5597c1fc4751a6ef2be3a84a41bebf3db67048a1.