Gallery2: Revert DRM feature

 * Missing framework support in M, revisit later.

Revert "Gallery2 : Drm file can be set as wallpaper"

This reverts commit b00985f4.

Revert "Gallery2 : Drm lock icon added on Photo widget for drm content"

This reverts commit 4f3e4961.

Revert "Gallery2 : GIF animated drm file can be visible in Gallery app"

This reverts commit f5b491b1.

Revert "Gallery2 : Delete and Details options are not visible on Camera preview"

This reverts commit 704bff73.

Revert "Gallery2 : Video share option is not working"

This reverts commit ea87a93d.

Revert "Gallery2 : Uses internal Drm image decoder api in Gallery app"

This reverts commit 01f5f347.

Revert "Gallery2 : Added support for Oma drm (CD and SD)"

This reverts commit 43044da1.

Revert "Gallery2: Make Gallery2 support OMADRM feature"

This reverts commit 829f9ad8.

Change-Id: I4300285fd8539eb2e3134a0e472a087b83a0228f