refactor: console log verbosity

As a cosmetic change, slighlty reduce VM/SP header log verbosity from:

SP0x8001@0x0: NOTICE:  Booting Secure Partition (ID: 8001)
SP0x8001@0x0: Built : 00:09:27, Jul 26 2024
SP0x8001@0x0: v2.11(fvp,release):v2.11.0-39-g65442a9
SP0x8002@0x0: NOTICE:  Booting Secure Partition (ID: 8002)

to:

[8001/0] INFO:    ========================================
[8001/0] INFO:    End of FF-A setup and discovery tests
[8001/0] INFO:    ========================================
[8002/0] NOTICE:  Booting Secure Partition (ID: 8002)
[8002/0] Built : 14:02:18, Jul 26 2024

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: Ida76db12dae0368ba5774bfa6194035577295569
diff --git a/src/api.c b/src/api.c
index bb3bba7..8c1263a 100644
--- a/src/api.c
+++ b/src/api.c
@@ -4702,8 +4702,7 @@
 	ffa_id_t vcpu_id = vcpu_index(vcpu);
 
 	buffer->chars[buffer->len] = '\0';
-	dlog("%s%#x@%#x: %s\n", ffa_is_vm_id(vm_id) ? "VM" : "SP", vm_id,
-	     vcpu_id, buffer->chars);
+	dlog("[%x %u] %s\n", vm_id, vcpu_id, buffer->chars);
 	buffer->len = 0;
 }