ARM: dts: ls1021a-tqmals1021a: change sound card model name

ARM: dts: ls1021a-tqmals1021a: change sound card model name

The card name for ALSA is generated from the model name string and
is limited to 16 characters. Use a shorter name to prevent cutting the
name.
MBLS1021A uses the same audio codec as most i.MX based starter kits
by TQ-Systems. Adjust the sound card model to i.MX based platforms,
as done by commit e6303798b6ac4 ("arm64: dts: imx8mp-tqma8mpql-mba8mpxl:
change sound card model name"). This allows sharing a default asound.conf
in BSP over all the kits.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>