msm: iomap: Add fsm9900 support

Add the I/O map macro definitions and functions to create the early
I/O mappings for FSM9900 target

Change-Id: I44987bc932a560e26792902f002aa0300d8cfc0c
Acked-by: Kaushik Sikdar <ksikdar@qti.qualcomm.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>