target: msm8953: append params to cmdline based on a/b, verity status

 1. When verity and multislot both are enabled, append only
      "rootfstype=ext4"
    As, aboot logic will detects correct slot and appends it.

 2. When verity is ebabled, but multislot isn't, append
    ...rootfstype=ext4 root=/dev/dm-0 dm=\"system none ro,0 1
       android-verity /dev/mmcblk0p<NN>...

 3. When neither multislot or verity enabled, append,
    " rootfstype=ext4 root=/dev/mmcblk0p<NN> "

Change-Id: Ida86f67fb5bd12c6ecbb78c08a0b14c60a2be89f
1 file changed