Initial implementation of the Arm generic timer driver

The implementation provides register descriptions and drivers for the
CNTControlBase, CNTCTLBase, CNTReadBase, CNTBaseN, CNTEL0BaseN frames.
It also implements blocking and interrupt based timer wait functions.

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: Ie0f06bfc1e35d38c3e4929fe2288dc510b8cd8ee
diff --git a/dco.txt b/dco.txt
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+Developer Certificate of Origin
+Version 1.1
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+Developer's Certificate of Origin 1.1
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\ No newline at end of file