radeon: add smc ucode for BONAIRE

Add new ucode file and update the WHENCE entry. The
smc ucode is used by the power management controller
on the gpu.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

WHENCE

@@ -1533,6 +1533,7 @@ File: radeon/BONAIRE_pfp.bin
 File: radeon/BONAIRE_rlc.bin
 File: radeon/BONAIRE_sdma.bin
 File: radeon/BONAIRE_uvd.bin
+File: radeon/BONAIRE_smc.bin
 File: radeon/KABINI_ce.bin
 File: radeon/KABINI_me.bin
 File: radeon/KABINI_mec.bin