os/compression/compress_read.c: Reduce time taken to get block offset info for compressed binary
os/compression/compress_read.c: Reduce time taken to get block offset info for compressed binary

- Keep entire compression header, including block offsets, in memory
  when loading compressed binary.
- Overhead of time taken to get block's offset from file is eliminated.

Signed-off-by: Amandeep Chauhan <37755504c51ffa7243265501fdc704ed5e783aaa@samsung.com>

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