ARM: dts: msm: change the order of LAB/IBB regulator definition for PMI8950

LAB regulator is dependent on IBB regulator in non-standalone
mode of operation which is commonly used. Hence change the
order of regulator definitions in device tree so that IBB
resources will be available for use for LAB regulator.

Change-Id: I7c73efe489862754d15e36d5356f1b7771f16bf9
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>