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Add two new kdb environment access methods as kdb_setenv() and kdb_printenv() in order to abstract out environment access code from kdb command functions. Also, replace (char *)0 with NULL as an initializer for environment variables array. Signed-off-by: Sumit Garg <sumit.garg@linaro.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/1612771342-16883-1-git-send-email-sumit.garg@linaro.org [daniel.thompson@linaro.org: Replaced (char *)0/NULL initializers with an array size] Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>