ARM: dts: msm: Add tcsr configuration for sa8195p

The TCSR_PCIEPHY_LINK_CONFIG reg is 1 by default. This makes the linkage
status:
PCIe1: not enabled
PCIe2: x4 lane
Setting the reg to 0 changes the status to:
PCIe1: x2 lane
PCIe2: x2 lane
This change add the tcsr configuration for sa8195p and set it to 2x2 lane
mode by default.

Change-Id: Ie789aa7544c94cb207b27847dccefd39d6500280
Signed-off-by: Xiang Li <lixiang@codeaurora.org>