package: general waybeam encoder package for Infinity6E and Infinity6C

[snokvist]

Adds a Buildroot package waybeam: an H.265 video encoder and streamer for
SigmaStar Infinity6E (SSC338Q/SSC30KQ) and Infinity6C (SSC378QE). The SoC
backend is selected from OPENIPC_SOC_FAMILY. The source is MIT-licensed and
tracks OpenIPC/waybeam_venc master (currently v0.40.1).

Installs:

• /usr/bin/waybeam
• /usr/bin/json_cli (config editor)
• /etc/waybeam.json
• /etc/init.d/S95waybeam

Unlocked sensor modules (both families). Waybeam ships its own imx335/imx415
drivers with higher-FPS sensor modes:

• Infinity6E (Star6E): installs the unlocked sensor_imx{335,415}_star6e.ko
  over the stock /lib/modules/4.9.84/sigmastar/sensor_imx*_mipi.ko names
  (up to 144 fps IMX335 / 100 fps IMX415). No custom ISP bins — the SDK/stock
  tuning applies (isp.sensorBin defaults to empty).
• Infinity6C (Maruko): installs sensor_imx{335,415}_mipi.ko plus the
  matching /etc/sensors/imx335.bin and imx415.bin, since there are no
  in-tree modules for these sensors on I6C.

Both are ordered after sigmastar-osdrv-sensors and the family's
sigmastar-osdrv-infinity6{e,c} so the modules install over the stock ones.

waybeam and Majestic cannot be built together (depends on !BR2_PACKAGE_MAJESTIC): both drive the same sensor and encoder, and the
SigmaStar OSDRV MI libraries are installed to /usr/lib only when Majestic
is not selected. The package ships no libraries; OSDRV provides them.

Defaults in /etc/waybeam.json: UDP RTP output enabled to
udp://192.168.1.10:5600, resolution auto (sensor native), ROI and audio
disabled. isp.sensorBin is empty, which is valid — the encoder falls back
to the SDK default ISP tuning, so video comes up on first boot. The config is
kept in sync with the v0.40.1 schema (carries the attitude section; the dead
frameLost field, removed from the encoder in v0.19.0, was dropped).

Verified with scoped Buildroot builds on both families (Majestic off). Each
uses the Buildroot toolchain; the Infinity6C build installs the binary,
json_cli, both sensor modules, both ISP bins, config and init script:

• Infinity6E — glibc binary.
• Infinity6C (SSC378QE) — musl binary.

Verification note for the Star6E sensor modules: they ship prebuilt
(stripped --strip-debug) and must match the target kernel's vermagic. They
were built against the OpenIPC Infinity6E 4.9.84 kernel; a scoped I6E build +
boot check that sensor_imx335_mipi.ko / imx415.ko insmod cleanly and the
new modes enumerate is the remaining gate (the Maruko modules were validated
the same way).

[flyrouter]

Good afternoon.
Thanks for sending the PR.
There are almost no issues with its formatting.
However, in the next few days we will need to clarify a few organisational matters and I will let you know in PM before merging.
Thanks.