Documentation: imx: external boot capable SOC list complete
The iMX35 SOC supports both internal and external boot mode, and both modes
are supported by barebox.
The iMX35 is the latest SOC with support for this mode, none of the later
iMX series iMX50, 51, 53, 6SL, 6SDL, 6DQ, 7S or 7D does support it.
Let's complete the list.
Signed-off-by: Alexander Kurz <akurz@blala.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>