arm64: dts: agilex/stratix10: Fix qspi node compatible

The QSPI flash node needs to have the required "jedec,spi-nor"
in the compatible string.

Fixes: 0cb140d0 ("arm64: dts: stratix10: Add QSPI support for Stratix10")
Cc: stable@vger.kernel.org
Suggested-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>