soc: pinctrl-lpi: Disable core clock only if it is enabled

Clock driver throws warning when clock disable is called
without enable. Disable core clock only if the respective clock
enable is successful to avoid this warning.

Change-Id: I489647a444c9be326e5805c353385240c6c6d0fc
Signed-off-by: Aditya Bavanari <abavanar@codeaurora.org>