ARM: dts: msm: Resort to default spm-level in sdm710

System-pm level 5 turns off other regulators of UFS
in addition to the VCC. The VDD_PX10 supply is ON for
UFS configuration & turning it off causes a leakage.

Hence, resort to the default spm-level.

CRs-fixed: 2279765
Change-Id: Iadf1a0b26c84134e49c2c0207c852105b74ad660
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>