msm: apq8084: Enable low power mode drivers at boot

Low Power Mode drivers need to be initialized before many other platform
devices. Initialize these drivers in board file.
Allow the architecture to compile and include low power mode drivers in
Kconfig.

Change-Id: Ib8ab3642e67402ca0e55880cf5fea8d6e1570072
Signed-off-by: Praveen Chidambaram <pchidamb@codeaurora.org>