ARM: dts: msm: Untrusted pointer dereference

To avoid access of variable after being freed, using
list_first_entry_safe function to iterate over list
of given type,safe against removal of list entry.

Change-Id: I70611fddf3e9b80b1affa3e5235be24eac0d0a58
Signed-off-by: Monika Singh <monising@codeaurora.org>