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-microgea-stm32mp1-microdev2-of7_defconfig b/configs/stm32mp15-microgea-stm32mp1-microdev2-of7_defconfig
index 31e8907..aa6a28e 100644
--- a/configs/stm32mp15-microgea-stm32mp1-microdev2-of7_defconfig
+++ b/configs/stm32mp15-microgea-stm32mp1-microdev2-of7_defconfig
@@ -73,6 +73,7 @@
 CONFIG_DM_RTC=y
 CONFIG_RTC_STM32=y
 CONFIG_SERIAL_RX_BUFFER=y
+CONFIG_SYSRESET_SYSCON=y
 CONFIG_WDT=y
 CONFIG_WDT_STM32MP=y
 # CONFIG_BINMAN_FDT is not set