nb/intel/gm45: Add C_ENVIRONMENT_BOOTBLOCK support

The i82801ix_early_init is now called both in the bootblock and
romstage. The rationale behind setting this up twice is to ensure
bootblock-romstage compatibility in the future if for instance VBOOT
is used.

This moves the console init to the bootblock.

The romstage now runs uncached. Adding a prog_run hooks to set up an
MTRR to cache the romstage will be done in a followup patch.

The default size of 64KiB is not modified for the bootblock as trying
to fit both EHCI and SPI flash debugging needs a more space and 64KiB
is the next power of 2 size that fits it.

TESTED on Thinkpad X200.

Change-Id: I8f59736cb54377973215f35e35d2cbcd1d82c374
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35992
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/northbridge/intel/gm45/bootblock.c b/src/northbridge/intel/gm45/bootblock.c
index c076c55..d3aeb03 100644
--- a/src/northbridge/intel/gm45/bootblock.c
+++ b/src/northbridge/intel/gm45/bootblock.c
@@ -11,13 +11,14 @@
  * GNU General Public License for more details.
  */
 
+#include <cpu/intel/car/bootblock.h>
 #include <device/pci_ops.h>
 
 /* Just re-define these instead of including gm45.h. It blows up romcc. */
 #define D0F0_PCIEXBAR_LO 0x60
 #define D0F0_PCIEXBAR_HI 0x64
 
-static void bootblock_northbridge_init(void)
+void bootblock_early_northbridge_init(void)
 {
 	uint32_t reg;