ARM: dts: msm: Add and enable Tj based modem_v2x mitigation for SA515

Add support for modem_v2x cooling device and enable Tj based modem_v2x
mitigation for SA515 variants based on latest recommendation.

Change-Id: I825fa7a09928bf401daab088abbe8761839281dd
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>