pci: consolidate address comparisons

pci: consolidate address comparisons

This patch replaces pci_addr_comparison() and memcmp() of pci addresses by
rte_eal_compare_pci_addr().

To compare PCI addresses, rte_eal_compare_pci_addr() doesn't use memcmp().
This is because sizeof(struct rte_pci_addr) returns 6, but actually
this structure is like below.

struct rte_pci_addr {
        uint16_t domain;                /**< Device domain */
        uint8_t bus;                    /**< Device bus */
        uint8_t devid;                  /**< Device ID */
        uint8_t function;               /**< Device function. */
};

If the structure is dynamically allocated in a function without bzero,
last 1 byte may have value. As a result, memcmp may not work.
To avoid such a case, rte_eal_compare_pci_addr() compare following values.

        dev_addr = (addr->domain << 24) | (addr->bus << 16) |
                                (addr->devid << 8) | addr->function;

Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>