cmd: broadcom: add cmd to update bnxt image env variables

Add command to update the environmental variables which
are used to read the data from QSPI offsets and load
the binaries to bnxt.

Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2 files changed