Revert "clocksource/drivers/timer-ti-dm: Handle dra7 timer wrap errata i940"

This reverts commit 6d5fda43 as it
breaks the kernel abi at the moment.  It will be restored at a later
point in time.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Iea57a9d0a515147279ca20077501179ff18b5ee2