arm64: Kconfig: make CMDLINE_FORCE depend on CMDLINE

When building allmodconfig KCONFIG_ALLCONFIG=$(pwd)/arch/arm64/configs/defconfig
CONFIG_CMDLINE_FORCE gets enabled. Which forces the user to pass the
full cmdline to CONFIG_CMDLINE="...".

Rework so that CONFIG_CMDLINE_FORCE gets set only if CONFIG_CMDLINE is
set to something except an empty string.

Suggested-by: John Garry <[email protected]>
Acked-by: Will Deacon <[email protected]>
Signed-off-by: Anders Roxell <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>

Author: roxell

arch/arm64/Kconfig

@@ -1629,6 +1629,7 @@ config CMDLINE
 
 config CMDLINE_FORCE
 	bool "Always use the default kernel command string"
+	depends on CMDLINE != ""
 	help
 	  Always use the default kernel command string, even if the boot
 	  loader passes other arguments to the kernel.