arch/x86: Drop leftover ROMCC support

Remove the last bits of building romstage with romcc.

Change-Id: I70bb1ed23a5aeb87bf7641e0b0bd604a4e622e61
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/26807
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/cpu/Kconfig

@@ -8,7 +8,7 @@ if ARCH_X86
 
 config CACHE_AS_RAM
 	bool
-	default !ROMCC
+	default y
 
 config NO_CAR_GLOBAL_MIGRATION
 	bool

src/cpu/amd/geode_lx/syspreinit.c

@@ -35,8 +35,5 @@ static void StartTimer1(void)
 void SystemPreInit(void)
 {
 	/* they want a jump ... */
-#if !IS_ENABLED(CONFIG_CACHE_AS_RAM)
-	__asm__ __volatile__("jmp .+2\ninvd\njmp .+2\n");
-#endif
 	StartTimer1();
 }

src/cpu/x86/Kconfig

@@ -88,7 +88,6 @@ config NO_FIXED_XIP_ROM_SIZE
 config XIP_ROM_SIZE
 	hex
 	depends on !NO_FIXED_XIP_ROM_SIZE
-	default ROM_SIZE if ROMCC
 	default 0x10000
 
 config CPU_ADDR_BITS