i965/batch: don't ignore the 'brw_new_batch' call for a 'new batch'

i965/batch: don't ignore the 'brw_new_batch' call for a 'new batch'

If we restore the 'new batch' using 'intel_batchbuffer_reset_to_saved'
function we must restore the default state of the batch using
'brw_new_batch' function because the 'intel_batchbuffer_flush'
function will not do it for the 'new batch' again.
At least the following fields of the batch
'state_base_address_emitted','aperture_space', 'state_used'
should be restored to default values to avoid:
1. the aperture_space overflow
2. the missed STATE_BASE_ADDRESS commad in the batch
3. the memory overconsumption of the 'statebuffer'
   due to uncleared 'state_used' field.
etc.

v2: merge with new commits, changes was minimized, added the 'fixes' tag
v3: added in to patch series

Fixes: 3faf56ffbdeb "intel: Add an interface for saving/restoring
                     the batchbuffer state."
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107626
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>