drivers: display: add HUB12 LED matrix driver

Add driver for HUB12 interface monochrome LED matrix displays.

Features:
- 32x16 pixel resolution, 1-bit monochrome (PIXEL_FORMAT_MONO01)
- SPI-based data transfer with shift registers
- Configurable brightness control
- Thread-safe framebuffer access with semaphore

The driver implements the standard Zephyr display API

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