dts: Add DTS information about QUADSPI on stm32h7

Now in Zephyr only stm32f7 processors have by default provided support
for QSPI IP block.

The same IP block is also available in stm32h7 (with different offsets),
so proper DTS description shall be provided as well for it.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
1 file changed