Merge patch series "xPL-stack cleanup"

Simon Glass <sjg@chromium.org> says:

This series was split from the VBE part H series. It adjusts the logic
for selecting the top of the stack so that it is more consistent across
xPL phases.

Link: https://lore.kernel.org/r/20250228122042.1277079-1-sjg@chromium.org