elf headers fill virtual address for linearly mapped region

o For i386, Physical memory upto 896MB is linearly mapped. Hence virtual
  addresses for linearly mapped region are known.
o This patch sets the appropriate virtual addresses in core headers for
  linearly mapped region.
o Enables gdb to debug linearly mapped region without any special user space
  utility. Otherwise, capture tools first need to analyze the core image (Read
  page tables and/or vm areas) and determine virtual addresses for memory
  chunks and then regenerate the elf headers suitable for debugging with gdb.
o Some cases like 4G/4G split deviate from 896MB linearly mapped region and
  might have different value for PAGE_OFFSET. Probably its a good idea to
  export the linear region from kernel and use that instead of hard coding it.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>

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