drivers: soc: qcom: avoid double initialization of kobj

In rimps_memlat driver the rimps_kobj is initialized twice
once while creating and another while initializing and adding
to the parent kobj, which resulted in kernel warning.

Fix the double initialization of rimps_kobj.

Change-Id: I95c03d83f63cffd506b2f3ee36f1a6da9f4f1d31
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>