B (4098): Cx88: #ifdef cleanups

- moved CX88_BOARD_DVICO_FUSIONHDTV_DVB_T_DUAL frontend_attach code up
  to share the #ifdef block with CX88_BOARD_DVICO_FUSIONHDTV_DVB_T_PLUS

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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