topic: Remapped Flash over ITCM region in STM32F7x script

This patch remaps the Flash over ITCM region as virtual to ensure that
any breakpoint placed in this area will be automatically set as an
hardware breakpoint. This patch is a fix to a regression introduced with
changes #4429.

Change-Id: I03d46d8537ef06b33a3d4a2328274667c6481969
Signed-off-by: Rocco Marco Guglielmi <roccomarco.guglielmi@gmail.com>
Reviewed-on: http://openocd.zylin.com/5097


Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
Tested-by: jenkins

tcl/target/stm32f7x.cfg

@@ -51,6 +51,10 @@ set _FLASHNAME $_CHIPNAME.flash
 flash bank $_FLASHNAME stm32f2x 0 0 0 0 $_TARGETNAME
 flash bank $_CHIPNAME.otp stm32f2x 0x1ff0f000 0 0 0 $_TARGETNAME
 
+# Configuring the Flash via ITCM alias as virtual
+set _FLASH_ITCM_VMA itcm-flash.alias
+flash bank $_FLASH_ITCM_VMA virtual 0x00200000 0 0 0 $_TARGETNAME $_FLASHNAME
+
 # adapter speed should be <= F_CPU/6. F_CPU after reset is 16MHz, so use F_JTAG = 2MHz
 adapter_khz 2000