spi: dt-bindings: st,stm32mp25-ospi: Make "resets" a required property

spi: dt-bindings: st,stm32mp25-ospi: Make "resets" a required property

On STM32MP2x SoC's family, OSPI is child of Octo Memory Manager which
must have asccess to OSPI's reset to ensure its initialization.
Make "resets" a required property.

Fixes: bed97e35786a ("dt-bindings: spi: Add STM32 OSPI controller")
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20250324-upstream_ospi_required_resets-v2-1-85a48afcedec@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>