ARM: dts: stm32: add exti entries for USB PHY wakeup on stm32mp131

The two ports of USB PHY trigger respectively EXTI torvalds#42 and torvalds#43.
While the GIC is not used for wake-up, current code requires a
valid map to GIC irq. Use the OHCI interrupt on GIC torvalds#75.

Change-Id: I21b52a361e86d9fb147cb0758cd74ba724928cc4
Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/linux-stm32/+/274973
Reviewed-by: Antonio Maria BORNEO <antonio.borneo@st.com>
Reviewed-by: Amelie DELAUNAY <amelie.delaunay@foss.st.com>
Tested-by: Antonio Maria BORNEO <antonio.borneo@st.com>
Domain-Review: Amelie DELAUNAY <amelie.delaunay@foss.st.com>

arch/arm/boot/dts/stm32mp131.dtsi

@@ -369,6 +369,8 @@
 					<31 0 &intc GIC_SPI 54  IRQ_TYPE_LEVEL_HIGH>,
 					<32 0 &intc GIC_SPI 83  IRQ_TYPE_LEVEL_HIGH>,
 					<33 0 &intc GIC_SPI 84  IRQ_TYPE_LEVEL_HIGH>,
+					<42 0 &intc GIC_SPI 75  IRQ_TYPE_LEVEL_HIGH>,
+					<43 0 &intc GIC_SPI 75  IRQ_TYPE_LEVEL_HIGH>,
 					<44 0 &intc GIC_SPI 96  IRQ_TYPE_LEVEL_HIGH>,
 					<47 0 &intc GIC_SPI 92  IRQ_TYPE_LEVEL_HIGH>,
 					<48 0 &intc GIC_SPI 116 IRQ_TYPE_LEVEL_HIGH>,