package/nvidia-tegra23-codecs: new package

nvidia-tegra23-codecs provides various HW-accelerated media codecs, such
as: AAC3, h264, jpeg, MP3...

Signed-off-by: Nicolas Serafini <nicolas.serafini@sensefly.com>
[me:
  - split codecs from binaries into this patch
  - use our extractor helpers
]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

[Thomas:
  - Remove <pkg>_DEPENDENCIES variable that contained
    nvidia-tegra23-binaries, since this dependency is a runtime
    dependency only.
  - Remove 'NVIDIA_TEGRA23_CODECS_INSTALL_STAGING = NO', since this is
    the default.
  - Remove 'NVIDIA_TEGRA23_CODECS_INSTALL_TARGET = YES', since this is
    the default.
  - Instead of using a NVIDIA_TEGRA23_CODECS_FIRMWARE variable listing
    the firmware files to copy, simply copy all firmware files.]