boards: arm: stm32h7b3 disco reads the SFDP table from NOR

The sfdp table property is no more required in the DTS of the
stm32h7b3i_dk as it is correctly read from the external
NOR octoflash with the read-sfdp command.
(since PR zephyrproject-rtos#62521)

Signed-off-by: Francois Ramu <francois.ramu@st.com>

boards/arm/stm32h7b3i_dk/stm32h7b3i_dk.dts

@@ -259,13 +259,6 @@
 		spi-bus-width = <OSPI_OPI_MODE>;
 		data-rate = <OSPI_DTR_TRANSFER>;
 		status = "okay";
-		sfdp-bfp = [
-			53 46 44 50 06 01 02 ff
-			00 06 01 10 30 00 00 ff
-			C2 00 01 04 10 01 00 ff
-			84 00 01 02 C0 00 00 ff
-			00 00 00 00
-		];
 
 		partitions {
 			   compatible = "fixed-partitions";