[PATCH] APM emulation reunion

Hello,

here a patch to unify the APM enulation supports for ARM and MIPS.

I put APM emulation code into a dedicated directory so it can be used
to put there the APM-emu per board specific code. For instance on my
system I added the following lines to the "Kconfig" file:

   config CONFIG_WWPC1000_APM_EMU
          tristate "APM support for WWPC1000"
          depends APM_EMU
          default y

The kernel configuration file is now unique and not duplicated
anymore.

Also I modified the configuration define "CONFIG_APM" to
"CONFIG_APM_EMU" in order to avoid conflicts with real APM
support. Doing like this these boards' configuration files should be
updated:

   arch/arm/configs/bast_defconfig:CONFIG_APM=y
   arch/arm/configs/collie_defconfig:CONFIG_APM=y
   arch/arm/configs/corgi_defconfig:CONFIG_APM=y
   arch/arm/configs/ixp4xx_defconfig:CONFIG_APM=y
   arch/arm/configs/neponset_defconfig:CONFIG_APM=y
   arch/arm/configs/s3c2410_defconfig:CONFIG_APM=y
   arch/arm/configs/simpad_defconfig:CONFIG_APM=y
   arch/arm/configs/spitz_defconfig:CONFIG_APM=y
   arch/arm/configs/trizeps4_defconfig:CONFIG_APM=y