arch/x86: Add debug spinloops in assembly_entry.S

Use Kconfig values to enable debug spinloops in assembly_entry.S.  This
makes it easy to debug the assembly code.

TEST=Build and run on Galileo Gen2

Change-Id: Ic56bf2260b8e3181403623961874c9289f3ca945
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15135
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2 files changed