Resolve "first-gateware-version"

Closes #257

See merge request !1

monimod fantray support

See merge request !3

This change also make use of the PEC if enabled during the read of
UPTIME_SECS and TMR_ERROR_CNT registers.
Signed-off-by: Adam Wujek <dev_public@wujek.eu>

Without this commit the block read from non-block register could cause
the system to hang. The first read byte is interpreted as block length.
Which for non-block transfers is not true.
For example read of UPTIME_SECS of Monimod register could hang the system:
i2cdump -y 0x9 0x12 s 0xd7
Signed-off-by: Adam Wujek <dev_public@wujek.eu>

python3-pytest depends on
python3-attrs->python3-cryptography->python3-pycparser
but features used in pytest do not need cpp nor cpp-symlinks.
This reduces the size of rootfs image by ~8MB
Signed-off-by: Adam Wujek <dev_public@wujek.eu>

Signed-off-by: Adam Wujek <dev_public@wujek.eu>

Signed-off-by: Adam Wujek <dev_public@wujek.eu>

Signed-off-by: Adam Wujek <dev_public@wujek.eu>

Signed-off-by: Adam Wujek <dev_public@wujek.eu>

Under /chosen/uboot_version
Signed-off-by: Adam Wujek <dev_public@wujek.eu>