control: ucm: add ioctl to retrieve full card components

alsa-project/alsa-lib pull request #494 was edited from mstrozek:

The fixed-size components field in SNDRV_CTL_IOCTL_CARD_INFO can be too small on systems with many audio devices. The kernel [1] will provide a new ioctl to read the full string while truncating the original in card_info if it grows too big. Make sure alsa-lib can read the full string if the original is truncated.

[1] link to v3

Request URL : https://github.com/alsa-project/alsa-lib/pull/494 Patch URL : https://github.com/alsa-project/alsa-lib/pull/494.patch Repository URL: https://github.com/alsa-project/alsa-lib