refactor(tc): move SCMI clock DT binding into tc-base.dtsi

As SCMI clock DT bindings are common for TC platforms, move them into
'tc-base.dtsi'.

As a result, the file 'tc_vers.dtsi' is empty, so removes it.

Change-Id: Iaa7219bbbde8458dcfe01de7ad6c277a960357c5
Signed-off-by: Leo Yan <leo.yan@arm.com>
2 files changed