Tegra SoC has a Quad SPI controller starting from Tegra210.

This patch adds support for Tegra210 QSPI controller.
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Link: https://lore.kernel.org/r/1608585459-17250-5-git-send-email-skomatineni@nvidia.comSigned-off-by: Mark Brown <broonie@kernel.org>