Delete unused asm/sizes.h
i2c: JZ4750D: Add ingenic i2c driver for JZ4730, JZ4740 and JZ4750
JZ4750D: Partially revert 7673234e; As there's a separate i2c bus driver, there's no need to keep i2c.c in arch/mips/jz4750d; old helper module i2c_old.c is renamed back i2c.c