As latest update we have now 2 voltage swing tables for DP over DKL
PHY with only one difference in Level 0 pre-emphasis 3.
So with 2 tables for DP is time to have one single function to return
all DKL voltage swing tables.

BSpec: 49292
Cc: Khaled Almahallawy <khaled.almahallawy@intel.com>
Signed-off-by: NJosé Roberto de Souza <jose.souza@intel.com>
Tested-by: NKhaled Almahallawy <khaled.almahallawy@intel.com>
Reviewed-by: Khaled Almahallawy<khaled.almahallawy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200602205424.138143-1-jose.souza@intel.com