u-boot: lock environment variables to only active_system

Author: embetrix

recipes-bsp/u-boot/u-boot-stm32/0004-rework-stm32mp15x-defconfig.patch

@@ -69,7 +69,7 @@ index be25aaa7885..5908a573b2d 100644
  CONFIG_WDT_ARM_SMC=y
  CONFIG_WDT_STM32MP=y
  # CONFIG_BINMAN_FDT is not set
-@@ -171,3 +169,11 @@ CONFIG_ERRNO_STR=y
+@@ -174,3 +169,11 @@ CONFIG_ERRNO_STR=y
  # CONFIG_LMB_USE_MAX_REGIONS is not set
  CONFIG_LMB_MEMORY_REGIONS=2
  CONFIG_LMB_RESERVED_REGIONS=16
@@ -81,6 +81,10 @@ index be25aaa7885..5908a573b2d 100644
 +CONFIG_ECDSA=y
 +CONFIG_ECDSA_VERIFY=y
 +CONFIG_OF_CONTROL=y
++CONFIG_ENV_WRITEABLE_LIST=y
++CONFIG_ENV_FLAGS_LIST_DEFAULT="active_system:dw"
++CONFIG_ENV_FLAGS_LIST_STATIC="active_system:dw"
+
 -- 
 2.34.1