i2c-mlxbf: Add repeated start condition support

i2c-mlxbf: Add repeated start condition support

Add support for SMBus repeated start conditions to the Mellanox I2C
driver. This support is specifically enabled for the
I2C_FUNC_SMBUS_WRITE_I2C_BLOCK implementation which is required for
communication with a specific I2C device on BlueField 3.

Signed-off-by: Chris Babroski <cbabroski@nvidia.com>
Reviewed-by: Asmaa Mnebhi <asmaa@nvidia.com>
Reviewed-by: Khalil Blaiech <kblaiech@nvidia.com>
Link: https://lore.kernel.org/r/20250506193059.321345-1-cbabroski@nvidia.com
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>