ARM: dts: msm: Update core mapping for silver core thermal zones for SM6150

Update cpu core mappings for silver core thermal zones for emergency
cpu isolation rules based on latest recommendation for SM6150.

Change-Id: If4407e5549400a2bd14300e50f233081054f5d2f
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>