samples: jesd216: Exclude hifive_unleashed and unmatched boards

The HiFive Unleashed and HiFive Unmatched boards do not enable the
SPI0 controller that the flash is connected to. This test will not
build on these platforms because SPI0 bus controller is missing.

Signed-off-by: Katsuhiro Suzuki <[email protected]>

Author: katsuster

samples/drivers/jesd216/sample.yaml

@@ -3,7 +3,7 @@ sample:
 tests:
   sample.drivers.jesd216:
     tags: spi flash
-    platform_exclude: hifive1 mimxrt1170_evk_cm7 mimxrt1170_evk_cm4
+    platform_exclude: hifive1 hifive_unleashed hifive_unmatched mimxrt1170_evk_cm7 mimxrt1170_evk_cm4
     filter: dt_compat_enabled("jedec,spi-nor")
     harness: console
     harness_config: