cm3-ftest: change to use arm disassemble

Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>

testing/examples/cortex/cm3-ftest.cfg

@@ -63,7 +63,7 @@ proc load_and_run { name halfwords n_instr } {
 	mwh $addr 0xe7fe
 
 	# disassemble, as sanity check and what's-happening trace
-	cortex_m3 disassemble 0x20000000 [expr 1 + $n_instr ]
+	arm disassemble 0x20000000 [expr 1 + $n_instr ]
 
 	# Assume that block of code is at most 16 halfwords long.
 	# Create a basic table of loop-to-self exception handlers.