staging: rtl8188eu: hal: rtl8188e_cmd: Use ether_addr_copy() instead of memcpy()

The checkpatch.pl found the warning:
WARNING: Prefer ether_addr_copy() over memcpy() if the Ethernet
addresses are __aligned(2)

Checked if the the Ethernet addresses are __aligned(2) by using pahole
tool. The type of pwlanhdr is struct ieee80211_hdr and pahole shows that
addr1, addr2, and addr3 are aligned to u16.

struct ieee80211_hdr {
        __le16                     frame_control;        /*     0     2 */
        __le16                     duration_id;          /*     2     2 */
        u8                         addr1[6];             /*     4     6 */
        u8                         addr2[6];             /*    10     6 */
        u8                         addr3[6];             /*    16     6 */
        __le16                     seq_ctrl;             /*    22     2 */
        u8                         addr4[6];             /*    24     6 */

        /* size: 30, cachelines: 1, members: 7 */
        /* last cacheline: 30 bytes */
};

Both eeprompriv from struct adapter and MacAddress from struct
wlan_bssid_ex have the offset multiple of sizeof(u16).

Also, the array bc_addr and the pointers: StaAddr, mac, and bssid,
start from an even offset.

Signed-off-by: Georgiana Rodica Chelu <georgiana.chelu93@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>