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Initialize drivers that need ordering separately 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: I56c3c2dd75a13a7ae43b7665b8c227ba2ee198eb
Signed-off-by: Praveen Chidambaram <pchidamb@codeaurora.org>