Add ssc377_lite_tp-link-tapo-c120-v1 profile - #57

ssc377_raptor is ssc377d_raptor on the suffixless 64 MB part: 16 MB NOR,
8192k rootfs, no radio. ssc377_tapo_c120 derives from it and adds what
that camera has -- an RTL8188FTV on USB, the supplicant, and a baked
U-Boot environment whose one non-default line is wlandev.

The radio needs two pins driven before it exists, and both are board
knowledge, which is why this is a target and not a symbol:

  GPIO 42 (PAD_FUART_RX) gates the radio's supply. This tree's kernel
  holds it low -- the infinity6c padmux table muxes the pad to PWM0 at
  boot and an idle PWM output is a low -- while the vendor's device
  tree leaves it alone. A gpio export claims the pad back, so the arm
  in /etc/wireless/usb needs no kernel change. OpenIPC/builder#57 and
  the C120 page in OpenIPC/wiki#549 drive the same pin.

  GPIO 8 (PAD_UART1_TX) is the chip enable, pulsed the way the stock
  firmware's tmpd_insmod_driver does it: low a second, high, two more,
  insmod. The vendor's kernel carries the same pad table as ours, so
  the number means the same thing here.

Detection cannot find a radio whose power is off, so wlandev has to be
set before S40network runs; on a camera with no login yet the only
place for that is the environment, hence the mkenvimage blob written
through make_full_image.sh's ENV_BIN.

Board status, from one C120: the full image boots, the baked
environment is read, the arm runs, and the enable net rises on its own
once it does -- GPIO 42 gating the supply is confirmed on that unit.
Enumeration and association are not verified: the unit's RTL8188FTV
had been damaged before the arm was corrected and never came up.