stm32mp15: remove configs dependency on CONFIG_TFABOOT

Remove the dependency on CONFIG_TFABOOT in stm32mp Kconfig
- always activate the ARCH config: CONFIG_ARCH_SUPPORT_PSCI
  and CONFIG_CPU_V7_HAS_NONSEC
- CONFIG_ARMV7_NONSEC is deactivated in trusted defconfig
- the correct sysreset driver is activated in each defconfig:
  CONFIG_SYSRESET_PSCI or SYSRESET_SYSCON

Reported-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/configs/stm32mp15_defconfig b/configs/stm32mp15_defconfig
index 02457eb..4c6a52f 100644
--- a/configs/stm32mp15_defconfig
+++ b/configs/stm32mp15_defconfig
@@ -8,10 +8,12 @@
 CONFIG_ENV_SECT_SIZE=0x40000
 CONFIG_DEFAULT_DEVICE_TREE="stm32mp157c-ev1"
 CONFIG_TARGET_ST_STM32MP15x=y
+CONFIG_DDR_CACHEABLE_SIZE=0x10000000
 CONFIG_CMD_STM32KEY=y
 CONFIG_CMD_STM32PROG=y
 CONFIG_ENV_OFFSET_REDUND=0x4C0000
 CONFIG_TYPEC_STUSB160X=y
+# CONFIG_ARMV7_NONSEC is not set
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_SYS_LOAD_ADDR=0xc2000000
 CONFIG_FIT=y
@@ -126,6 +128,7 @@
 CONFIG_DM_SPI=y
 CONFIG_STM32_QSPI=y
 CONFIG_STM32_SPI=y
+CONFIG_SYSRESET_PSCI=y
 CONFIG_TEE=y
 CONFIG_OPTEE=y
 # CONFIG_OPTEE_TA_AVB is not set