drm/i915: Only poll DW3_A when init DDI PHY for ports B and C.

According to Bspec we need to
"Poll for PORT_REF_DW3_A grc_done == 1b"
only on ports B and C initialization sequence when
copying rcomp from port A.

So let's follow the spec and only poll for that case
and not on every port A initialization.

v2: Also remove the grc_done check from bxt_ddi_phy_is_enabled()
    otherwise it might believe it is disabled and force it to re program.

Cc: Imre Deak <[email protected]>
Cc: Ander Conselvan de Oliveira <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Reviewed-by: Imre Deak <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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