ARM: dts: imx7-colibri: Update audio card name

ARM: dts: imx7-colibri: Update audio card name

Update the audio card name for Colibri iMX7 to match its specific SoM
name, making it compliant with the other names for Colibri iMX6 and
Apalis iMX6.

While this is a breaking change for userspace tooling, it seems
time to implement it since no ALSA UCM or related configuration files
currently exist and we are in the the process of creating them.

Signed-off-by: Hiago De Franco <hiago.franco@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>