chipset_enable.c: Mark Intel C224 as DEP

Tested on a Supermicro X10SLM+-F. The flash chip has been read, written,
and erased many times without issue. Most boards with this chipset will
have the ME region locked, hence the selection of DEP.

Change-Id: I25126b94e691289a7b29dd81d5c864854a4e0245
Signed-off-by: Tristan Corrick <tristan@corrick.kiwi>
Reviewed-on: https://review.coreboot.org/c/30361
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/chipset_enable.c b/chipset_enable.c
index cbb88fd..4d624a3 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -1841,7 +1841,7 @@
 	{0x8086, 0x8c51, NT,  "Intel", "Lynx Point",			enable_flash_pch8},
 	{0x8086, 0x8c52, NT,  "Intel", "C222",				enable_flash_pch8},
 	{0x8086, 0x8c53, NT,  "Intel", "Lynx Point",			enable_flash_pch8},
-	{0x8086, 0x8c54, NT,  "Intel", "C224",				enable_flash_pch8},
+	{0x8086, 0x8c54, DEP, "Intel", "C224",				enable_flash_pch8},
 	{0x8086, 0x8c55, NT,  "Intel", "Lynx Point",			enable_flash_pch8},
 	{0x8086, 0x8c56, NT,  "Intel", "C226",				enable_flash_pch8},
 	{0x8086, 0x8c57, NT,  "Intel", "Lynx Point",			enable_flash_pch8},