spi_qsd: Add support for pinctrl

As part of pinctrl frame work migration, add support
for GPIO configuration using pinctrl frame work.

Now SPI driver supports both pinctrl frame work as
well as GPIO mux to configure GPIO's.

CRs-Fixed: 554189
Change-Id: Ie4232e181705e8c352079fdec882ff4b59bf074f
Signed-off-by: Sana Venkat Raju <c_vsana@codeaurora.org>