spi: spi_qsd: Add snapshot of SPI BLSP driver

This change adds a snapshot of SPI BLSP driver
from the 4.19 branch.
This is snapshot of the SPI BLSP driver as of
msm-4.19 'commit 717e1e28321a ("Merge "SPI:
spi_qsd: Add snapshot of SPI QSD driver"")'.

Change-Id: I9ce403c8d64aac6e916fa9e213ade59ebc213c5b
Signed-off-by: Vipin Deep Kaur <vkaur@codeaurora.org>