tests: drivers: smbus: add packet error correction (pec) testsuite Add tests for SMBus packet error correction (PEC). The two primary utilities tested are * smbus_pec(): compute the PEC byte for a Block Write * smbus_read_check_pec(): verify a PEC after * Read Byte * Read Word * Block Read Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>