move all hardware specific mapping out of generic vm code

[phanikishoreg]

ACPI Initialization and other Hardware table mappings are currently mixed between miniacpi.c and vm.c in platform/i386. Need to move Hardware specific mappings out of generic vm code, perhaps into miniacpi.c and use vm interface to map hardware pages in.

Also, platform/i386/kernel.h is used to expose lot of other interfaces from different kernel modules, this should be changed, and should be more structured, with interfaces specific to modules (confined namespace).