aboot: update command line in common code
aboot: update command line in common code

Command line update is done for atags as well as device tree.
Device tree logic should not have awareness of commandline
modification and the reverse dependency. Now updating
commandline before sending to device tree and atag logic.

(cherry picked from commit 10c7d1cdd3d005c3f924a0387d28d264c3a135ad)

Change-Id: I8b40ecfd44ff1dfeefe4614ff62ab1bbbf6acb5d

M1cha/mi2_lk,utilite2/lk,oubeichen/lk-v500,utilite2/lk,pichina/lk,oubeichen/lk-v500,oubeichen/lk-v500,M1cha/mi2_lk,pichina/lk,M1cha/mi2_lk,pichina/lk,utilite2/lk,M1cha/mi2_lk,pichina/lk,utilite2/lk,oubeichen/lk-v500,utilite2/lk,M1cha/mi2_lk,oubeichen/lk-v500,pichina/lk