SPI: spi_qsd: Add snapshot of SPI QSD driver

This change adds a snapshot of SPI QSD driver from the 4.4 branch.
kernel-4.4 baseline: 'e29d253ecf048
("msm: mdss: dsi: Remove redundant opmode configuration")'

Change-Id: I9464063ad5a1a46aa6bc3e1dd3564eac9b8941d9
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>