Roll src/third_party/minigbm 71db2b55..682d73bd.

git log 71db2b55..682d73bd --date=short --no-merges --format='%ad %ae %s'
2016-12-27 gurchetansingh@chromium.org minigbm: cros_gralloc: don't fail BO_USE_SW_*_OFTEN | BO_USE_RENDERING allocation
2016-09-06 hoegsberg@chromium.org rockchip: Add support for AFBC buffers
2016-12-21 henryhsu@chromium.org minigbm: fix size_t type not found
2016-12-19 gurchetansingh@chromium.org minigbm: consolidate flags
2016-12-14 gurchetansingh@chromium.org minigbm: tegra: add blocklinear detiling logic
2016-12-16 dcastagna@chromium.org minigbm: Remove (c) from copyright notice.

BUG=chrome-os-partner:56407

Review-Url: https://codereview.chromium.org/2624863002
Cr-Commit-Position: refs/heads/master@{#442789}

DEPS

@@ -423,7 +423,7 @@ deps_os = {
 
     # Graphics buffer allocator for Chrome OS.
     'src/third_party/minigbm/src':
-      Var('chromium_git') + '/chromiumos/platform/minigbm.git' + '@' + '71db2b551d3b189b0266052446aee35152a2eae3',
+      Var('chromium_git') + '/chromiumos/platform/minigbm.git' + '@' + '682d73bd00595a493bd446c5274bef08bd17c096',
 
     # Userspace interface to kernel DRM services.
     'src/third_party/libdrm/src':