drivers/stm32_gpio: register GPIO resources as secure or not
drivers/stm32_gpio: register GPIO resources as secure or not

Register in the shared resources driver the secure or non-secure state
of the GPIO pins.

Change-Id: Ifda473bcbbb0af799be6587961d6641edf887605
Signed-off-by: Etienne Carriere <f21bc5b8f3ea1962eb45af359f1abea6578cab94@st.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware