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Initialize drivers that need ordering separetely and before the
devicetree initialization. LPM and RPM drivers have ordering
requirements and may be needed by other drivers that are initialized
by platform device.

Also update the init_irq function to initialize MPM.

Change-Id: If7ed790a72dca74089044c7d4722d071bd1f932a
Signed-off-by: Praveen Chidambaram <pchidamb@codeaurora.org>