openmax: Buffer flag processing scheme change after EOS.

openmax: Buffer flag processing scheme change after EOS.

Add tag INDEX_AFTER_EOS = 0xE05.
In the case of after EOS,
1. MFC DD will return INDEX_AFTER_EOS tag.
2. OpenMAX will detect INDEX_AFTER_EOS tag.
3. OpenMAX will return buffer(with timestame = 0x0 and flags = 0x0).

< Without patch >
Sometimes, OpenMAX will return EOS flag twice when using ACodec.

Depends On
 - Change I57265bc8: MFC: MEDIA: EXYNOS: Change default tag of EOS

Change-Id: I5090887eb626fba14d5cba946ff71e3709ec4cfe
Signed-off-by: SeungBeom Kim <sbcrux.kim@samsung.com>