x86: coral: Adjust various config options

x86: coral: Adjust various config options

Add ms so it is easier to search for tables in memory.

Expand the command-line and print buffers so that we can deal with the
very long ChromeOS command lines. (typically 700 characters).

Enable BOOTSTD_FULL to get the full set of standard-boot options.

Replace the existing manual script with 'bootflow scan', since it can
find and boot the OS.

Finally, expand the malloc() space so we can read large kernels into a
bootflow.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>