This patch removes all instances of the `protected_mode_jump` API and its associated header file. The API is no longer used by any code within the tree. BUG=b:332759882 TEST=Built and booted 64-bit coreboot with 32-bit payload successfully. Change-Id: I3eb31b09c92512338ccc540f60289960bd6bf439 Signed-off-by: Subrata Banik <subratabanik@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/82372 Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>