tcl: [3/3] prepare for jimtcl 0.81 'expr' syntax change

Jimtcl commit 1843b79a03dd ("expr: TIP 526, only support a single
arg") drops the support for multi-argument syntax for the TCL
command 'expr'.

Fix manually the remaining lines that don't match simple patterns
and would require dedicated boring scripting.
Remove the 'expr' command where appropriate.

Change-Id: Ia75210c8447f88d38515addab4a836af9103096d
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/6161
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

tcl/target/stm32mp15x.cfg

@@ -107,7 +107,7 @@ proc toggle_cpu0_dbg_claim0 {} {
 
 proc detect_cpu1 {} {
 	$::_CHIPNAME.ap1 mem2array cpu1_prsr 32 0xE00D2314 1
-	set dual_core [expr $cpu1_prsr(0) & 1]
+	set dual_core [expr {$cpu1_prsr(0) & 1}]
 	if {! $dual_core} {$::_CHIPNAME.cpu1 configure -defer-examine}
 }