rom.sh: just remove the coreboot cook function

ccache isn't used at all in any of the configs

ensuring that this remains the case is much
cleaner. coreboot will never enable it by default,
precisely because of how buggy it is.

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/fw/rom.sh

@@ -65,9 +65,6 @@ corebootpremake()
 	[ "$XBMK_RELEASE" = "y" ] && [ "$release" = "n" ] && \
 		return 0
 
-	$if_not_dry_build \
-		cook_coreboot_config
-
 	fx_ check_coreboot_util printf "cbfstool\nifdtool\n"
 
 	printf "%s\n" "${version%%-*}" > "$srcdir/.coreboot-version" || \
@@ -77,14 +74,6 @@ corebootpremake()
 		x_ "$mk" download "$target"; :
 }
 
-cook_coreboot_config()
-{
-	if [ -z "$mode" ] && [ -f "$srcdir/.config" ]; then
-		printf "CONFIG_CCACHE=n\n" >> "$srcdir/.config" || \
-		    err "can't cook '$srcdir'" "cook_coreboot_config" "$@"
-	fi
-}
-
 check_coreboot_util()
 {
 	[ "$badhash" = "y" ] && \