Define VM ID base

Change-Id: Iaf9ab6814c3d32458020112af2b84d9b67351a64
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/main.c b/main.c
index a8ce62b..bb3bcdb 100644
--- a/main.c
+++ b/main.c
@@ -41,6 +41,7 @@
 #define CONFIG_HAFNIUM_MAX_VMS   16
 #define CONFIG_HAFNIUM_MAX_VCPUS 32
 
+#define HF_VM_ID_BASE 0
 #define FIRST_SECONDARY_VM_ID (HF_VM_ID_OFFSET + 1)
 
 struct hf_vcpu {