r600g: don't use dynamic state allocation for states

r600g: don't use dynamic state allocation for states

Simplify state handly by avoiding state allocation.
Next step is to allocate once for all context packet
buffer and then avoid rebuilding pm4 packet each time
(through use of combined crc) this would also avoid
number of memcpy.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>