radeon: add mc2 firmware for SI/CI GPUs

Add new MC ucode for SI/CI GPUs and update
WHENCE entry.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

WHENCE

@@ -1522,12 +1522,14 @@ File: radeon/ARUBA_pfp.bin
 File: radeon/ARUBA_rlc.bin
 File: radeon/PITCAIRN_ce.bin
 File: radeon/PITCAIRN_mc.bin
+File: radeon/PITCAIRN_mc2.bin
 File: radeon/PITCAIRN_me.bin
 File: radeon/PITCAIRN_pfp.bin
 File: radeon/PITCAIRN_rlc.bin
 File: radeon/PITCAIRN_smc.bin
 File: radeon/TAHITI_ce.bin
 File: radeon/TAHITI_mc.bin
+File: radeon/TAHITI_mc2.bin
 File: radeon/TAHITI_me.bin
 File: radeon/TAHITI_pfp.bin
 File: radeon/TAHITI_rlc.bin
@@ -1535,24 +1537,28 @@ File: radeon/TAHITI_uvd.bin
 File: radeon/TAHITI_smc.bin
 File: radeon/VERDE_ce.bin
 File: radeon/VERDE_mc.bin
+File: radeon/VERDE_mc2.bin
 File: radeon/VERDE_me.bin
 File: radeon/VERDE_pfp.bin
 File: radeon/VERDE_rlc.bin
 File: radeon/VERDE_smc.bin
 File: radeon/OLAND_ce.bin
 File: radeon/OLAND_mc.bin
+File: radeon/OLAND_mc2.bin
 File: radeon/OLAND_me.bin
 File: radeon/OLAND_pfp.bin
 File: radeon/OLAND_rlc.bin
 File: radeon/OLAND_smc.bin
 File: radeon/HAINAN_ce.bin
 File: radeon/HAINAN_mc.bin
+File: radeon/HAINAN_mc2.bin
 File: radeon/HAINAN_me.bin
 File: radeon/HAINAN_pfp.bin
 File: radeon/HAINAN_rlc.bin
 File: radeon/HAINAN_smc.bin
 File: radeon/BONAIRE_ce.bin
 File: radeon/BONAIRE_mc.bin
+File: radeon/BONAIRE_mc2.bin
 File: radeon/BONAIRE_me.bin
 File: radeon/BONAIRE_mec.bin
 File: radeon/BONAIRE_pfp.bin
@@ -1575,6 +1581,7 @@ File: radeon/KAVERI_rlc.bin
 File: radeon/KAVERI_sdma.bin
 File: radeon/HAWAII_ce.bin
 File: radeon/HAWAII_mc.bin
+File: radeon/HAWAII_mc2.bin
 File: radeon/HAWAII_me.bin
 File: radeon/HAWAII_mec.bin
 File: radeon/HAWAII_pfp.bin