nissa: disable `flash` shell command
Support for `flash test` statically allocates a 4kB buffer, and we don't
need that command. Disable it to save 4 kB of RAM.
TEST=build nereid, RAM usage is reduced
BRANCH=none
@@ -19,6 +19,9 @@ CONFIG_SHELL_MINIMAL=n
CONFIG_LOG=y
CONFIG_LOG_BACKEND_UART=y
+# Unnecessary features, disabled to save memory
+CONFIG_FLASH_SHELL=n
+
# Standard shimmed features
CONFIG_PLATFORM_EC_BACKLIGHT_LID=y
CONFIG_PLATFORM_EC_CONSOLE_CMD_SYSINFO=y
