board: mt7988: add env var for ramsize

R4:
BPI-R4> printenv ram_gb
ram_gb=4

R4Pro:
BPI-R4> printenv ram_gb
ram_gb=8

boot/fit: handle null in wrong configuration node

boot/fit: print name of config node not found

Show name of configuration node which was not found.

current state gives no hint if fit image is wrong or the requested name.

Could not find configuration node
load of <NULL> failed

After this patch we see name like this:

Could not find configuration node '#ov-test'
load of <NULL> failed

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>

ci: add r4pro

arm: dts: get nvme working for r4pro

arm64: dts: enable pcie3 in bpi-r4 emmc/nand dts

ci: fix pipeline for r4pro

dts: r4: fix nvme for emmc/spi by enabling pcie3

dts: r4: fix nvme for emmc/spi by enabling pcie3

dts: r4: fix nvme for emmc/spi by enabling pcie3