i2c: ls2x-v2: Add driver for Loongson-2K0300 I2C controller

i2c: ls2x-v2: Add driver for Loongson-2K0300 I2C controller

This I2C module is integrated into the Loongson-2K0300 SoCs.

It provides multi-master functionality and controls all I2C bus-specific
timing, protocols, arbitration, and timing. It supports both standard
and fast modes.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/c5a6c4e5ea675410ff1b946b988c280c22bf3dc4.1776135865.git.zhoubinbin@loongson.cn