hw/arm/fsl-imx8mp: Remove unused define

The SoC has three SPI controllers, not four.
Remove the extra define of an SPI IRQ.

Fixes: 06908a84f036 "hw/arm/fsl-imx8mp: Add SPI controllers"
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Message-ID: <20250318205709.28862-4-shentey@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

include/hw/arm/fsl-imx8mp.h

@@ -238,7 +238,6 @@ enum FslImx8mpIrqs {
     FSL_IMX8MP_ECSPI1_IRQ   = 31,
     FSL_IMX8MP_ECSPI2_IRQ   = 32,
     FSL_IMX8MP_ECSPI3_IRQ   = 33,
-    FSL_IMX8MP_ECSPI4_IRQ   = 34,
 
     FSL_IMX8MP_I2C1_IRQ     = 35,
     FSL_IMX8MP_I2C2_IRQ     = 36,