Log Message:
Update to 2.6.0

Changelog:
2.6.0
enable the mutiple driver selection logic and enable it for DRM.
drm: Add iHD to driver_name_map
Add missed slice parameter 'slice_data_num_emu_prevn_bytes'
ensure that all meson files are part of the release tarball
configure: use correct comparison operator
trace: support VAConfigAttribMultipleFrame in trace
remove incorrect field of VAConfigAttribValDecJPEG
va/va_trace: Dump VP9 parameters for profile 1~3
add multiple frame capability report
add variable to indicate layer infromation
trace: fix memory leak on closing the trace
add prediction direction caps report
Add comments for colour primaries and transfer characteristics in \ 
VAProcColorProperties

2.5.0
Correct the comment of color_range.
Add VA_FOURCC_A2B10G10R10 for format a2b10g10r10.
Adjust VAEncMiscParameterQuantization structure to be align with \ 
VAEncMiscParameterBuffer(possible to impact BC)
Add attribute for max frame size
Add va_footer.html into distribution build
va_trace: hevc profiles added
Add new definition for input/output surface flag
va/va_trace: add trace support for VAEncMiscParameterTypeSkipFrame structure.
va/va_trace: add MPEG2 trace support for MiscParam and SequenceParam
va_openDriver: check strdup return value
Mark some duplicated field as deprecated
Add return value into logs
va/va_trace: add trace support for VAEncMiscParameterEncQuality structure.
Add newformat foucc defination
va_backend: remove unneeded linux/videodev2.h include
va_trace: add missing <sys/time.h> include
configure: don't build glx if VA/X11 isn't built
va/va_trace: unbreak with C89 after b369467
[common] Add A2RGB10 fourcc definition
build: meson: enables va messaging and visibility
va/va_trace: add trace support for RIR(rolling intra refresh).
va/va_trace: add trace support for ROI(region of interest).

2.4.0
va_TraceSurface support for VA_FOURCC_P010
Add pointer to struct wl_interface for driver to use
(integrate) va: fix new line symbol in error message
av: avoid driver path truncation
Fix compilation warning (uninit and wrong variable types) for Android O MR1
Allow import of the DRM PRIME 2 memory type
android: ignore unimportant compile warnnings
compile: fix sign/unsign compare in va_trace.c
android: replace utils/Log.h with log/log.h
High Dynamic Range Tone Mapping: Add a new filter for input metadata and some \ 
comments.
Remove restrictions on vaSetDriverName()