vbe: Provide VPL binman-symbols for the next phase

Add support for moving from TPL->VPL->SPL so that the VPL build can fit
properly into the boot flow.

Use #ifdefs to avoid creating unwanted symbols which Binman would then
try (and perhaps fail) to provide.

Add debugging to indicate the next phase.

Signed-off-by: Simon Glass <sjg@chromium.org>
1 file changed