TCL scripts: update to current "flash bank" syntax

While "flash bank" syntax has been changed long ago,
several tcl script are still not fully update.

Fix following cases related with "cfi" driver:
- syntax error: the mandatory <name> parameter is missing
- warning: the <target> parameter is a number, instead of
  the target name
- the comment line above the command does not report
  actual syntax

Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>

tcl/board/dm6446evm.cfg

@@ -31,7 +31,8 @@ if { [info exists J4_OPTION] } {
 if { $CS2_MODE == "NOR" } {
 	# 16 Mbytes address space; 16 bit bus width
 	# (older boards used 32MB parts, with upper 16 MB unusable)
-	flash bank cfi 0x02000000 0x01000000 2 2 $_TARGETNAME
+	set _FLASHNAME $_CHIPNAME.flash
+	flash bank $_FLASHNAME cfi 0x02000000 0x01000000 2 2 $_TARGETNAME
 	proc flashprobe {} { flash probe 0 }
 } elseif { $CS2_MODE == "NAND" } {
 	# 64 Mbyte small page; 8 bit bus width