ARM: dts: msm: Update UFS spm-level to 5 on sdm670

On sdm670, VDD_PX10 regulator is updated to be default OFF
in sleep for UFS configuration. This change updates UFS
system pm-level to 5 which ensures higher power savings by
turning link off and power down device.

Change-Id: I055c948bf00960c93c295e9191b69d383e69bd19
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>