ARM: dts: msm: Fix register offset to read PHY status

Fix register offset used to check the PHY status after
enabling the PCIe pipe clock. Access to the DBI registers
requires an active pipe clock and the status register
indicates if the PHY is ready.

Change-Id: I8a50835e698714bf96b56735b0b17af60adb535c
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>
Signed-off-by: Ajay Prathi <aprathi@codeaurora.org>