nb/intel/pineview: Move to C_ENVIRONMENT_BOOTBLOCK

This adds a file i82801gx/bootblock_gcc.c since other targets that
don't yet C_ENVIRONMENT_BOOTBLOCK still use the romcc compiled
bootblock.c.

Tested on Foxconn D41S.

Change-Id: I7e74838b0d5e9c192082084cfd9821996f0e4c50
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/30939
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/northbridge/intel/pineview/pineview.h

@@ -236,7 +236,6 @@ u32 decode_igd_gtt_size(const u32 gsm);
 u8 decode_pciebar(u32 *const base, u32 *const len);
 
 /* Mainboard romstage callback functions */
-void mb_enable_lpc(void);
 void get_mb_spd_addrmap(u8 *spd_addr_map);
 void mb_pirq_setup(void); /* optional */