msm: camera: Restore Mercury hardware JPEG decoder driver

jb-rel kernels preserved the support in the code and only delete the driver directory.

Note: Restore form develop branch that include this commits:

 - https://github.com/mifl/android_kernel_pantech_oscar/commit/51a0d3fe908b6e1d5afb82d869442ed47361c81a
 - https://github.com/mifl/android_kernel_pantech_oscar/commit/4b84b9067274c136699a2962cb0752d14d7a802f

Change-Id: Ife3bd6645c85e1d4d68f9922f5cdfa07644b72ee