soc/intel/quark: Add C bootblock

Add a bootblock which builds with C_ENVIRONMENT_BOOTBLOCK selected.
This is the first piece in supporting FSP 2.0.  Move esraminit from
romstage into the bootblock.  Replace cache_as_ram with
car_stage_entry.S and code in romstage.c

TEST=Build and run on Galileo Gen2

Change-Id: I14d2af2adb6e75d4bff1ebfb863196df04d07daf
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15132
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
10 files changed