Add some time related tags read

Below tags are added:
TAG_DATETIME_DIGITIZED
TAG_SUBSEC_TIME
TAG_SUBSEC_TIME_ORIG
TAG_SUBSEC_TIME_DIG

Bug: 6374612
Change-Id: I5c10cf9725ca733df61c25afbff19010dd494c8f
Rename libexif to libjhead, since that's what it is

Change-Id: Ide9dfc4a6486fb8ae66724099bc7f3d4083d13c7
am 6c59af60: Merge "Fix compilation issue for 64bit"

* commit '6c59af6011c9ba9892fb94bd0df8147cf2c0ec12':
  Fix compilation issue for 64bit
am acbfc9c1: Rename libexif to libjhead, since that\'s what it is

* commit 'acbfc9c1c7e1a84b0db4dc5bc3d5346b6c55c473':
  Rename libexif to libjhead, since that's what it is
am a724ce28: am acbfc9c1: Rename libexif to libjhead, since that\'s what it is

* commit 'a724ce28e33e90a1af70b0e24af64849d62cb845':
  Rename libexif to libjhead, since that's what it is
am 4cafb541: Merge "jhead: 64bit printf format issue"

* commit '4cafb5414eda39f88933063d78d083d43f355d6f':
  jhead: 64bit printf format issue
am 871af5c3: Merge commit \'64af6148cfd55ad55ea491473ed42c168299c94e\' into HEAD

* commit '871af5c305ce1d3087e58fae091c60c359f5fa45':
am e6319453: am 4cafb541: Merge "jhead: 64bit printf format issue"

* commit 'e6319453a9df9c714e078b5c8581360517077991':
  jhead: 64bit printf format issue
am ead2b496: am 871af5c3: Merge commit \'64af6148cfd55ad55ea491473ed42c168299c94e\' into HEAD

* commit 'ead2b4961589267398006d83fe2a91c66b42b442':