Add per board struct describing the external clock setup.

...-2.6.32/arch/mips/include/asm/mach-jz4740/board-qi_lb60.h

...st/files-2.6.32/arch/mips/include/asm/mach-jz4740/clock.h

...t/files-2.6.32/arch/mips/include/asm/mach-jz4740/jz4740.h

...t/linux/xburst/files-2.6.32/arch/mips/jz4740/board-n526.c

...inux/xburst/files-2.6.32/arch/mips/jz4740/board-qi_lb60.c

target/linux/xburst/files-2.6.32/arch/mips/jz4740/clock.c

target/linux/xburst/files-2.6.32/arch/mips/jz4740/clock.h

target/linux/xburst/files-2.6.32/arch/mips/jz4740/reset.c

target/linux/xburst/files-2.6.32/arch/mips/jz4740/setup.c

target/linux/xburst/files-2.6.32/arch/mips/jz4740/time.c