topic: Remapped Flash over ITCM region in STM32F7x script

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