[ewg] cxgb4/cxgb3 RHEL7.5 backport support

[Arjun Vynipadath]

Hey Vlad,

Please pull the following compat-rdma commits of RHEL7.5 backports from my for-vlad branch of 
https://github.com/arjunvynipadath/compat-rdma
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commit 80fe148ed9a68ee58e9dd00f459077080ab7c48e
Author: Arjun Vynipadath <arjun at chelsio.com>
Date:   Wed Jul 11 11:56:08 2018 +0530

    cxgb4: Use pci_set_vpd_size() for kernels < 4.16

commit 80fe148ed9a68ee58e9dd00f459077080ab7c48e
Author: Arjun Vynipadath <arjun at chelsio.com>
Date:   Wed Jul 11 11:56:08 2018 +0530

    cxgb4: Use pci_set_vpd_size() for kernels < 4.16

    - Fixes adapter initialization issues when using OFED-4.17 on lower kernels(< 4.16).

    Signed-off-by: Arjun Vynipadath <arjun at chelsio.com>

commit 8b99862bebb4a0df77509376dfa678fccd1a093d
Author: Arjun Vynipadath <arjun at chelsio.com>
Date:   Wed Jul 11 11:54:37 2018 +0530

    Bundle 1.19.1.0 firmware for Chelsio T4/T5/T6 adapters

    Signed-off-by: Arjun Vynipadath <arjun at chelsio.com>

commit 2fcfcf42b26ed8d31e72e75f50173bb758db2436
Author: Arjun Vynipadath <arjun at chelsio.com>
Date:   Wed Jul 11 11:54:01 2018 +0530

    Added RHEL7.5 support for cxgb4 and iw_cxgb4

    Signed-off-by: Arjun Vynipadath <arjun at chelsio.com>

commit cccd1bb74c5f8a8e79df0523071b960e97a52769
Author: Arjun Vynipadath <arjun at chelsio.com>
Date:   Wed Jul 11 11:53:03 2018 +0530

    Added RHEL7.5 support for cxgb3 and iw_cxgb3

    Signed-off-by: Arjun Vynipadath <arjun at chelsio.com>

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Thanks,
Arjun.