defconfig: kona: enable compilation of fastrpc driver

Enable compilation of the fastrpc driver, which provides a
communication mechanism that allows clients to make remote method
invocations across processor boundary to applications, compute
and sensors DSP processors.

Change-Id: Idb882c2fdfd150cb3987b89b2ba40268ee7ac9bc
Acked-by: Thyagarajan Venkatanarayanan <venkatan@qti.qualcomm.com>
Signed-off-by: Tharun Kumar Merugu <mtharu@codeaurora.org>