Add CONFIG_BIOSEMU define to guard all the bios emulator code

This patch fix the compile issue on the board that did not enable the bios emulator

Merge with /home/wd/git/u-boot/custodian/u-boot-testing

This is a BIOS emulator, porting from SciTech for u-boot, mainly for
ATI video card BIOS. and can be used for x86 code emulation by some
modifications.

Signed-off-by: Jason Jin <Jason.jin@freescale.

This is a BIOS emulator, porting from SciTech for u-boot, mainly for
ATI video card BIOS. and can be used for x86 code emulation by some
modifications.

Signed-off-by: Jason Jin <Jason.jin@freescale.com>

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