audio/msm7627a: Move LPA memory to bootloader heap

- Reduce the size of LPA buffer size to 496KB to accomodate
  it in bootloader heap and accordingly update the heap id

Change-Id: I06ceec06beb8b68e47a2041125019f03ff7484e6
Merge pull request #2 from TeamHackLG/cm-10.2

audio/msm7627a: Move LPA memory to bootloader heap