[PATCH] mtrr: fix incorrect type detection

[Stan.Hung at Dell.com]

Hi folks,

Here is the patch for bug: https://bugs.launchpad.net/fwts/+bug/1776427

cache_types() in mtrr.c trying to parse the memory range covered by MTRR or not.
If match, the "end" of the range will move to the the start of MTRR.

mtrr.c #234
  end = entry->start;

Ex:
  Memory 0x0000 ~ 0xFFFF
  MTRR   0x1000 ~ 0xFFFF WB
  MTRR   0x0000 ~ 0x0FFF WB

  In original flow, if we put this memory range into cache_types function.
  The first round check will update the range to 0x0000 ~ 0x1000
  Then it won't hit the 0x0000 ~ 0x0FFF MTRR and set the DEFAULT flag to identify the usage of default MTRR.

Regards,
Stan Hung
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