Support/Update 100G yml on AS9726-32D

Author: chihhan123

device/accton/x86_64-accton_as9726_32d-r0/Accton-AS9726-32D-100G/td4-as9726-32x100G.config.yml

@@ -24,7 +24,7 @@
 bcm_device:
   0:
     global:
-      pktio_mode: 1
+      pktio_mode: 0
       skip_protocol_default_entries: 1
       uft_mode: 3
       l3_alpm_template: 1