Don't read all 32-bits located at IMX8MQ_ROM_VERSION_*0 since that,
besides ROM version major in LSB, willl also contain minor components
which we don't account for in the following checks. Change the code to
only read LSB instead.

This is a port of a vendor U-Boot[1] commit
0377dc8 ("MLK-19465 imx8mq: Fix cpu
rev issue on B0.1 chip")

[1] https://source.codeaurora.org/external/imx/uboot-imx
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>