SPRacingH7NEO - Initial target support.

[hydra]

SPRacingH7NEO

• Next-generation STM32 H7 processor with hardware floating point unit for efficient flight calculations and faster ARM-Cortex M7 core running at 520Mhz.
• ExpressLRS True diversity 2.4Ghz radio receiver built in, with 2 power amplifiers (PA) and low noise amplifiers (LNA) for extended range.
• ELRS runs on an ESP32S3 dual core 240Mhz CPU with WIFI.
• ICM42688P gyro with power supply filtering.
• 8Mbps high-speed CAN tranceiver.
• 8 Motor outputs. DSHOT/OneShot/PWM for ESCs and Servos.
• 4MB of Dual Bank OctoSPI External Flash (2x2MB) for firmware.
• 6 Serial Ports - NOT shared with the USB socket, one dedicated to the on-board ELRS receiver.
• 2x Micro USB sockets, one for the H7, one for the ESP32S3.
• 4 corner-mounted RGB LEDs connected to the H7.
• 1 RGB LED for ELRS status.
• 1 LED for FC status.
• Dedicated corner outputs for programmable LEDs - great for orientation, racing and night flying.
• Stackable design with mezzaine IO connectors for future expansion (spi, uart, i2c, gpio, adc, exti)
• HD/DJI video connector (Standard 6-pin DJI pinout).
• 9V 3A regulator.
• 5V 3A regulator.
• 2x 4in1 ESC connectors.
• TVS diode for eliminating voltage spikes.
• TCXO with dedicated power supply for rock-solid 2.4Ghz link frequency stability.
• Battery monitoring for voltage and current.
• Developer friendly debugging port (SWD) and boot mode selection for the H7.
• Built-in JTAG debugger and COM port for the ESP32S3 for ELRS development.
• 3x Side-press buttons, 1 for ELRS and 2 for the H7. For binding/wifi/settings/bootloader control.
• Symmetrical design for a super tidy wiring.
• ELRS PWM/DShot connector for 4 more ELRS controlled PWM/DShot channels.
• JST-SH sockets and solder pads for IO. (2x4in1 ESC, UART, CAN, Debug, HD/DJI, PWM)
• Also supports direct connection external of SBus, SumH, SumD, Spektrum1024/2048, CRSF, FPort, SRXL/XBus
  receivers.
• H7 Firmware upgradable via USB, ESP32S3 firmware upgradable by Wifi, BF passthrough and USB.
• Standard 30.5mm mounting hole patterns with 4mm holes and grommets for 3mm screws.
• SP Racing logos.

[hydra]

Samples have been dispatched to ELRS devs already.

[hydra]

rebased on master.

[JyeSmith]

@hydra sounds like SP is no longer manufacturing. Closing this PR for now and it can be reopened in the future if things change.