brcm: Add nvram for Lenovo Yoga Tablet 2 830F/L and 1050F/L tablets

Add a NVRAM file for the brcmfmac43241b4 wifi chip found on the mainboard
of Lenovo Yoga Tablet 2 830F/L and 1050F/L tablets. This is based on
a copy of the existing brcmfmac43430a0-sdio.ilife-S806.txt NVRAM file with
various parameters changed to match the Lenovo Yoga Tablet 2 series.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>