tcl/target/ti_k3: Make Cortex-A processors optional

The AM2x family of K3 SoCs typically do not contain a Cortex-A53 or
A72 processor. So, make the cpu "up" functions available when armv8
processor count > 0.

Change-Id: I985b194fe7cc63e4134ad84ccd921cc456eb412f
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/7944
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

tcl/target/ti_k3.cfg

@@ -341,24 +341,26 @@ for { set _core 0 } { $_core < $_armv8_cores } { incr _core } {
 	}
 }
 
-# Setup ARMV8 proc commands based on CPU to prevent people confusing SoCs
-set _armv8_up_cmd "$_armv8_cpu_name"_up
-# Available if V8_SMP_DEBUG is set to non-zero value
-set _armv8_smp_cmd "$_armv8_cpu_name"_smp
-
-if { $_v8_smp_debug == 0 } {
-	proc $_armv8_up_cmd { args } {
-		foreach _core $args {
-			targets $_core
-			_cpu_no_smp_up
+if { $_armv8_cores > 0 } {
+	# Setup ARMV8 proc commands based on CPU to prevent people confusing SoCs
+	set _armv8_up_cmd "$_armv8_cpu_name"_up
+	# Available if V8_SMP_DEBUG is set to non-zero value
+	set _armv8_smp_cmd "$_armv8_cpu_name"_smp
+
+	if { $_v8_smp_debug == 0 } {
+		proc $_armv8_up_cmd { args } {
+			foreach _core $args {
+				targets $_core
+				_cpu_no_smp_up
+			}
 		}
+	} else {
+		proc $_armv8_smp_cmd { args } {
+			_armv8_smp_up
+		}
+		# Declare SMP
+		target smp {*}$_v8_smp_targets
 	}
-} else {
-	proc $_armv8_smp_cmd { args } {
-		_armv8_smp_up
-	}
-	# Declare SMP
-	target smp {*}$_v8_smp_targets
 }
 
 for { set _core 0 } { $_core < $_r5_cores } { incr _core } {