MAINTAINERS: Update my company e-mail address
    
    Following my recent transition from Imagination Technologies to the
    reincarnated MIPS company update MAINTAINERS entries accordingly.
    
    	binutils/
    	* MAINTAINERS: Update my company e-mail address.
    
    	gdb/
    	* MAINTAINERS: Update my company e-mail address.
    
    	sim/
    	* MAINTAINERS: Update my company e-mail address.