This commit adds new code and JAON file to support PFC
and MMU setting for PFC feature on z9264f-Q64 (40G) T0
and T1 support. The buffers_defaults_t0.json and
buffers_defaults_t1.json file has the recommended values
for T0 and T1 configuration.
Unit tested and verified by running JSON file and checking
the hardware registers and table in broadcom. THe settings
in hardware are reflecting the JSON values.
Signed-off-by: Harish Venkatraman <harish_venkatraman@dell.com>
