spi: spi-msm-geni: Add SPI GENI driver snapshot

This is a snapshot of SPI GENI driver and associated files
as of msm-4.19 'commit c01ec6b5c60a ("geni-qcom-se: Reduce
the ab of QUP Core2x clock")'.

Change-Id: Id23acc4fe0c69c6437f1567031f0e1536732822c
Signed-off-by: Vipin Deep Kaur <vkaur@codeaurora.org>