It is sometimes necessary to poll a memory-mapped register until its
value satisfies some condition. Introduce a family of convenience macros
that do this. Tight-loop and sleeping versions are provided with and
without timeouts.
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
Change-Id: Ia7db00cbe60ded8b0ed9bbff264aaea0841da92a
b3ed9c1138