Add Alder Lake support

Loosely based on commit 11680db4 (ichspi: Add Alder Lake support)
on flashrom master.

Beside a little change in descriptor detection, no difference to
Tiger Lake was found. Hence, add new PCI IDs as 500 series.

Change-Id: Icc1278755ff64f03128d8faadbca85a4ff76864d
Signed-off-by: Nico Huber <nico.h@gmx.de>
diff --git a/chipset_enable.c b/chipset_enable.c
index 7bd12e7..4683da4 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -2129,6 +2129,9 @@
 	{0x8086, 0x4389, B_S,    NT,  "Intel", "WM590",				enable_flash_pch500},
 	{0x8086, 0x438a, B_S,    NT,  "Intel", "QM580",				enable_flash_pch500},
 	{0x8086, 0x438b, B_S,    DEP, "Intel", "HM570",				enable_flash_pch500},
+	{0x8086, 0x51a4, B_S,    DEP, "Intel", "Alder Lake-P",			enable_flash_pch500},
+	{0x8086, 0x54a4, B_S,    DEP, "Intel", "Alder Lake-N",			enable_flash_pch500},
+	{0x8086, 0x7aa4, B_S,    NT,  "Intel", "Alder Lake-S",			enable_flash_pch500},
 #endif
 	{0},
 };