soc: qcom: Replace ARRAY_SIZE macro with strlen

ARRAY_SIZE returns size of array. While sending command string
we need to only pass size of actual command string, hence use
strlen in place of ARRAY_SIZE.

Change-Id: If0afc6b1209b03ae17472a17b34d9d403757bfd0
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>