ARM: dts: imx6qdl: add TQMa6{S,Q,QP} SoM

Add device trees for TQMa6S, TQMa6Q, and TQMa6QP embedded modules.
The A and B SoM variants are for hardware revisions that differ in
how the I2C devices are connected. For details, see [1].

This is a combination of the patches
  "arm: dt: imx6qdl: add tqma6[qdl] som on mba6 mainboard",
  "arm: dt: tqma6: add spi with spi nor flash on SOM",
  "arm: dt: add basic support for tqma6qp on mba6", and
  "arm: dt: imx6qdl-tqma6: use generic jedec,spi-nor"
from the TQMa6x BSP, with the MBa6 specific parts removed.

[1] https://support.tq-group.com/en/arm/tqma6x/linux/ptxdist/overview



Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
[bst@pengutronix.de: remove unnecessary container node in the iomuxc
 node]
Signed-off-by: Bastian Krause <bst@pengutronix.de>
[p.zabel@pengutronix.de: merged patches from TQMa6x BSP REV.0114,
 separated MBa6 DTs, fixed checkpatch and dtbs_check warnings,
 added no-sd(io) properties to eMMC, added SPDX license identifiers
 and commit message]
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>