stm32mp1: use the command env info in env_check

Activate CMD_NVEDIT_INFO and use the new command "env info -d -p -q"
to automatically save the environment on first boot.

This patch allows to remove the env_default variable.
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: NPatrice Chotard <patrice.chotard@st.com>

arch/arm/mach-stm32mp/Kconfig

@@ -45,6 +45,7 @@ config STM32MP15x
 	select STM32_RESET
 	select STM32_SERIAL
 	select SYS_ARCH_TIMER
+	imply CMD_NVEDIT_INFO
 	imply SYSRESET_PSCI if TFABOOT
 	imply SYSRESET_SYSCON if !TFABOOT
 	help

include/configs/stm32mp1.h

@@ -157,9 +157,7 @@
 	"splashimage=0xc4300000\0"  \
 	"ramdisk_addr_r=0xc4400000\0" \
 	"altbootcmd=run bootcmd\0" \
-	"env_default=1\0" \
-	"env_check=if test $env_default -eq 1;"\
-		" then env set env_default 0;env save;fi\0" \
+	"env_check=if env info -p -d; then env save; fi\0" \
 	STM32MP_BOOTCMD \
 	BOOTENV \
 	"boot_net_usb_start=true\0"