boards: xtensa: add support for DOIT ESP32 DevKit V1

This patch adds support for the DOIT ESP32 DevKit V1, an entry-level
development board based on the ESP32-WROOM-32.

Main features:
- ESP32-WROOM-32 module (4 MB Flash, 520 KB SRAM)
- Dual-core Xtensa LX6 processor up to 240 MHz
- 802.11b/g/n Wi-Fi and Bluetooth v4.2 BR/EDR + BLE
- CP2102 USB-to-UART bridge
- Onboard blue LED connected to GPIO2
- All GPIO pins exposed on 2x15 pin headers

The board has been tested with the following Zephyr samples:
- samples/basic/blinky
- samples/hello_world

Signed-off-by: Siratul Islam <sirat4757@gmail.com>
15 files changed