cpu/x86/tsc: compile same code for all stages

The delay_tsc.c code took different paths depending
__PRE_RAM__ being defined or not. Also, timer_monotonic_get()
was only compiled in a !__PRE_RAM__ environment. Clean up
the code paths by employing CAR_GLOBAL for the global state
which allows the same code to be used in all stages.

Lastly, handle apollolake fallout now that init_timer() is
not needed in placeholders.c.

Change-Id: Ia769fa71e2c9d8b11201a3896d117097f2cb7c56
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/14301
Tested-by: build bot (Jenkins)
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Andrey Petrov <andrey.petrov@intel.com>
2 files changed