Revert "ozone: set the right GBM_BO_ flags"

This reverts commit 2e75e890.

Reason for revert: Breaks build for veyron_minnie and probably other devices. Sample of the compiler errors below:

../../ui/ozone/platform/drm/gpu/drm_thread.cc:120:15: error: use of undeclared identifier 'GBM_BO_USE_TEXTURING'; did you mean 'GBM_BO_USE_RENDERING'?
      flags = GBM_BO_USE_TEXTURING;
              ^~~~~~~~~~~~~~~~~~~~
              GBM_BO_USE_RENDERING
../../../.cros_cache/chrome-sdk/tarballs/veyron_minnie+9588.0.0+sysroot_chromeos-base_chromeos-chrome.tar.xz/usr/include/gbm.h:230:4: note: 'GBM_BO_USE_RENDERING' declared here
   GBM_BO_USE_RENDERING    = (1 << 2),
   ^


Original change's description:
> ozone: set the right GBM_BO_ flags
> 
> minigbm doesn't allow to pass no flags to gbm_bo_create(). GBM_BO_USE_TEXTURING
> implies texture, so use GBM_BO_USE_TEXTURING to create texture buffer.
> 
> GBM_BO_USE_TEXTURING implies GPU_READ. GBM_BO_USE_RENDERING implies GPU_WRITE.
> BufferUsage::SCANOUT needs both of them because it implies GPU_READ_WRITE.
> 
> TEST=run chrome on amd64-generic
> BUG=683347
> 
> Change-Id: I7431be6f5b4a8d95e6be11d86cfbf0c14b919668
> Reviewed-on: https://chromium-review.googlesource.com/549095
> Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
> Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
> Reviewed-by: David Reveman <reveman@chromium.org>
> Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
> Reviewed-by: Dongseong Hwang <dongseong.hwang@intel.com>
> Commit-Queue: Dongseong Hwang <dongseong.hwang@intel.com>
> Cr-Commit-Position: refs/heads/master@{#488709}

TBR=marcheu@chromium.org,reveman@chromium.org,dnicoara@chromium.org,dongseong.hwang@intel.com,glevin@chromium.org,dcastagna@chromium.org,gurchetansingh@chromium.org

Change-Id: I2a8327004c3ba78ca406d08b02b28515c2b2dcf0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 683347
Reviewed-on: https://chromium-review.googlesource.com/582347Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488762}

ui/ozone/platform/drm/gpu/drm_thread.cc

@@ -117,17 +117,16 @@ void DrmThread::CreateBuffer(gfx::AcceleratedWidget widget,
   uint32_t flags = 0;
   switch (usage) {
     case gfx::BufferUsage::GPU_READ:
-      flags = GBM_BO_USE_TEXTURING;
       break;
     case gfx::BufferUsage::SCANOUT:
-      flags = GBM_BO_USE_RENDERING | GBM_BO_USE_SCANOUT | GBM_BO_USE_TEXTURING;
+      flags = GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING;
       break;
     case gfx::BufferUsage::SCANOUT_CPU_READ_WRITE:
-      flags = GBM_BO_USE_LINEAR | GBM_BO_USE_SCANOUT | GBM_BO_USE_TEXTURING;
+      flags = GBM_BO_USE_SCANOUT | GBM_BO_USE_LINEAR;
       break;
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE:
     case gfx::BufferUsage::GPU_READ_CPU_READ_WRITE_PERSISTENT:
-      flags = GBM_BO_USE_LINEAR | GBM_BO_USE_TEXTURING;
+      flags = GBM_BO_USE_LINEAR;
       break;
   }