flash: stellaris: fix deprecated command

flash: stellaris: fix deprecated command

The driver directly runs a TCL command that has been renamed with
commit 4d99e77419e3 ("jtag/hla: Restructure commands"), while the
original name has been deprecated.

Update the TCL command to the new syntax.

Change-Id: I2fc9ef9a209bae1d78951e253d54164b2ac00cdd
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Fixes: 4d99e77419e3 ("jtag/hla: Restructure commands")
Reviewed-on: https://review.openocd.org/c/openocd/+/8832
Reviewed-by: zapb <dev@zapb.de>
Tested-by: jenkins