samples: spi_fram: add spi FRAM sample app
Add a sample app to demonstrate the usage of Fujitsu SPI
FRAM.
It uses SPI 1 on quark spi controller and gpio 20 as CS.
Change-Id: I30c83bdd8312ca0cab7a62e397c0cb4ade0821cb
Signed-off-by:
Baohong Liu <baohong.liu@intel.com>
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