htc-protou: new device (HTC Desire X) (!588)

Changes in the kernel defconfig:
- disable ANDROID_PARANOID_NETWORK (removes network restrictions)
- enable CONFIG_USB_G_ANDROID and CONFIG_DIAG_CHAR (for USB networking)
- enable DEVTMPFS (needed for udev -> touch support in weston)
- enable FB_MSM_DEFAULT_DEPTH_RGB565 (for 16-bit support to avoid red
  screen)
- enable SYSVIPC (so busybox' syslogd can log to a ringbuffer in the
  kernel)
- enable VT (for virtual terminal over USB)

[ci:skip-build]: already built successfully in CI