[media] em28xx: add [2013:025f] PCTV tripleStick (292e)

Empia EM28178, Silicon Labs Si2168, Silicon Labs Si2157.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --cc drivers/media/usb/em28xx/Kconfig
Simple merge

diff --cc drivers/media/usb/em28xx/em28xx-cards.c
Simple merge

diff --cc drivers/media/usb/em28xx/em28xx-dvb.c
Simple merge

diff --cc drivers/media/usb/em28xx/em28xx.h
Simple merge