ARM: dts: msm: Add Coresight IPCB TGU properties for sdm845.

Add TGU configuration properties tgu-steps, tgu-conditions,
tgu-timer-counters supported by the TGU. These properties
are needed for programming the IPCB TGU.

Change-Id: I3fe06f48dd1e29f41598ed9d254e0e79a010a6ee
Signed-off-by: Rama Aparna Mallavarapu <aparnam@codeaurora.org>