soc/amd/cezanne: Initialize I2C

soc/amd/cezanne: Initialize I2C

Add I2C initialization in romstage and ramstage.

TEST=To test the I2C connection on Majolica, which doesn't have SPD
connection, call the function below after i2c_soc_init is called.
     i2c_read_bytes(2, 0x4d, addr, data, 1);/* Read out 1 byte one time */
It can get the register values of TMP432B.

Or
     /* Override EC port in ec.h */
     #define EC_DATA	0x662
     #define EC_SC	0x666
     ec_write(0xA9, 0x40);
     i2c_read_bytes(1, 0x10, addr, data, 2);/* Read out 2 bytes one time */
It can get the register values of CM32181A3OP(ALS).

Change-Id: I3a2a1494b44b68e8d8204fba0c90e769e0256e6f
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51029
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>