Update dng_sdk to 1.7.1 2471 Bug: 483697751 Bug: 483693973 Test: make Flag: EXEMPT BUGFIX Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:831d3991198533c26e8fd2bf963e494e99bc6593 Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:a9d47d71823b31089b2bac7d078d62b0eb56cd37 Merged-In: I25ad017a3b1bdf00bf4b773ba508a43aab470a33 Change-Id: I25ad017a3b1bdf00bf4b773ba508a43aab470a33