[Arista] Add BTHD and CTD HW SKUs (#12878)

* sonic-mgmt: add blackhawk-th4-dd ansible hwsku variable

Add the blackhawk TH4 DD HW SKU variable to the
broadcom TH4 ansible variable list.

* sonic-mgmt: add catalina-dd ansible hwsku variable

Add the Catalina DD HW SKU variable to the
broadcom TH4 ansible variable list.

Author: ccroy-arista

ansible/group_vars/sonic/variables

@@ -14,6 +14,7 @@ broadcom_td3_hwskus: ['Arista-7050CX3-32S-C32', 'Arista-7050CX3-32S-D48C8']
 broadcom_th_hwskus: ['Force10-S6100', 'Arista-7060CX-32S-C32', 'Arista-7060CX-32S-C32-T1', 'Arista-7060CX-32S-D48C8', 'Celestica-DX010-C32', "Seastone-DX010" ]
 broadcom_th2_hwskus: ['Arista-7260CX3-D108C8',  'Arista-7260CX3-C64', 'Arista-7260CX3-Q64']
 broadcom_th3_hwskus: ['DellEMC-Z9332f-M-O16C64',  'DellEMC-Z9332f-O32']
+broadcom_th4_hwskus: ['Arista-7060DX5-32', 'Arista-7060DX5-64S']
 broadcom_j2c+_hwskus: ['Nokia-IXR7250E-36x100G', 'Nokia-IXR7250E-36x400G', 'Arista-7800R3A-36DM2-C36', 'Arista-7800R3A-36DM2-D36', 'Arista-7800R3AK-36DM2-C36', 'Arista-7800R3AK-36DM2-D36']
 broadcom_jr2_hwskus: ['Arista-7800R3-48CQ2-C48', 'Arista-7800R3-48CQM2-C48']