video: add BGR10A2_LE pixel format

This pixel format is a packed 4:4:4 RGB with alpha channel (B-G-R-A),
R/G/B channel has 10 bits and alpha channel is the MSB 2 bits.
15 jobs for fmt-a2rgb10 in 50 minutes and 17 seconds (queued for 1 second)
Status Job ID Name Coverage
  Preparation
passed #212595
gst indent

00:00:47

passed #212594
manifest

00:00:36

 
  Build
passed #212596
build fedora x86_64

00:09:17

passed #212597
build nodebug fedora x86_64

00:09:10

 
  Test
passed #212598
check fedora

00:03:34

passed #212599
integration testsuites fedora

00:11:55

 
  Full Builds
passed #212601
build cerbero android universal

00:10:39

passed #212602
build cerbero cross win32

00:07:33

passed #212603
build cerbero cross win64

00:05:35

passed #212600
build cerbero fedora x86_64

00:06:22

 
  Full Tests
passed #212607
valgrind bad

00:09:22

passed #212604
valgrind base

00:09:58

passed #212605
valgrind good

00:11:27

passed #212606
valgrind ugly

00:01:37

 
  Apps
passed #212608
android universal examples

00:06:08