coresight: of_get_coresight_platform_data needs both OF and CORESIGHT

The file that defines of_get_coresight_platform_data() is indeed
dependent on CONFIG_OF but the entire coresight directory depends
on CONFIG_CORESIGHT so both need to be enabled to make the symbol
resolve.
Also fix inline specifier.

Change-Id: Ifbec805db02ed02d6887537bb64d9d7dedb18ae9
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>