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/ti/am335x/memlayout.ld b/src/soc/ti/am335x/memlayout.ld
index 720da26..042febe 100644
--- a/src/soc/ti/am335x/memlayout.ld
+++ b/src/soc/ti/am335x/memlayout.ld
@@ -9,6 +9,7 @@
 	SRAM_START(0x402f0400)
 	BOOTBLOCK(0x402f0400, 20K)
 	FMAP_CACHE(0x402f0400+20K, 2K)
+	CBFS_MCACHE(0x402f0400+20K+2K, 8K)
 	TTB(0x402F8000, 16K)
 	ROMSTAGE(0x402F8000+16K, 40K)