Fix for BKSV values zero

[shivakumar7512]

cp_downstream_info structure, which is from the kernel(drm_mode.h) having following member,
struct cp_downstream_info {
char bksv[DRM_MODE_HDCP_KSV_LEN];
bool is_repeater;
__u8 depth;
__u32 device_count;
char ksv_list[DRM_MODE_HDCP_KSV_LEN * DRM_MODE_HDCP_MAX_DEVICE_CNT];
};

whereas in the HDCP-daemon, we have 2 more additional members at the beginning of structure such as version and cp_type, passing this structure reference to the memmove will cause incompatible data alignment among the members. So passing the reference of the structure with the index of bksv[0] will solve the bksv values getting displayed as ZERO .

Change-Id: Ia3d88dcbfc8e686eca14994e118d038585a16b5f