drm/i915/tgl: select correct bit for port select

Bit definitions for port-select got changed for TRANS_CLK_SEL &
TRANS_DDI_FUNC_CTL registers in TGL.

v2 (Lucas):
  - Nuke TRANS_DDI_PORT_NONE since it's 0: we are already clearing
    {TGL_,}TRANS_DDI_PORT_MASK (suggested by Ville)
  - Also cover haswell_get_ddi_port_state() in intel_display.c that was
    missing
  - Define macros using the _SHIFT macros so we don't lose other users

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190713010940.17711-3-lucas.demarchi@intel.com