UPSTREAM: coresight: tmc: Add configuration support for trace buffer size

Now that we can dynamically switch between contiguous memory and
SG table depending on the trace buffer size, provide the support
for selecting an appropriate buffer size.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(Upstream commit c34cc23f1dcb77c66b5cd074f83dee61bfcbe567).

Bug: 140266694
Change-Id: Iaa86f2aedefcb48a95fe8d4db7e37d9dc7a2fddf
Signed-off-by: Yabin Cui <yabinc@google.com>