drivers: i2c_sam0: Add i2c slave support #24047
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The existing sam0 i2c driver does not support slave mode.
This commit enables slave support for sam0 devices.
The Slave support is based on Linux I2C Slave support by Wolfram Sang
and documented at
https://www.kernel.org/doc/Documentation/i2c/slave-interface
The code for this commit is largely based on code taken from PR #5224
and the stm mcu implementation. This was modified to work with the
sam0 SERCOM perhiperal and integrated into the sam0 driver.
Fix whitespace and comments
Fixes #21711