Convert all Intel i810 boards to CAR.

Convert all Intel i810 boards to CAR.

 - Drop "select ROMCC" from the boards, as well as early_mtrr stuff.

 - Add "select CACHE_AS_RAM" to socket_PGA370/Kconfig, as well as the
   usual DCACHE_RAM_BASE and DCACHE_RAM_SIZE variables.

 - In socket_PGA370/Makefile.inc add:
   cpu_incs += $(src)/cpu/intel/car/cache_as_ram.inc

 - Other smaller related fixes.

Abuild-tested and boot-tested on MSI MS-6178.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Peter Stuge <peter@stuge.se>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5949 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1