cbfs: Enable CBFS mcache on most chipsets

This patch flips the default of CONFIG_NO_CBFS_MCACHE so the feature is
enabled by default. Some older chipsets with insufficient SRAM/CAR space
still have it explicitly disabled. All others get the new section added
to their memlayout... 8K seems like a sane default to start with.

Change-Id: I0abd1c813aece6e78fb883f292ce6c9319545c44
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38424
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/soc/sifive/fu540/memlayout.ld b/src/soc/sifive/fu540/memlayout.ld
index fd63dc0..b365b96 100644
--- a/src/soc/sifive/fu540/memlayout.ld
+++ b/src/soc/sifive/fu540/memlayout.ld
@@ -12,8 +12,9 @@
 {
 	L2LIM_START(FU540_L2LIM)
 	BOOTBLOCK(FU540_L2LIM, 64K)
-	CAR_STACK(FU540_L2LIM + 64K, 20K)
-	PRERAM_CBMEM_CONSOLE(FU540_L2LIM + 84K, 8K)
+	CAR_STACK(FU540_L2LIM + 64K, 12K)
+	PRERAM_CBMEM_CONSOLE(FU540_L2LIM + 76K, 8K)
+	CBFS_MCACHE(FU540_L2LIM + 84K, 8K)
 	FMAP_CACHE(FU540_L2LIM + 92K, 2K)
 	ROMSTAGE(FU540_L2LIM + 128K, 128K)
 	PRERAM_CBFS_CACHE(FU540_L2LIM + 256K, 128K)