kernel: Bump to 6.1.74

kernel: drm: rp1: rp1-vec: Allow non-standard modes with various crops
See: raspberrypi/linux#5845

kernel: vc4 DLIST patches for 6.1
See: raspberrypi/linux#5880

kernel: fixup! irqchip: irq-bcm2712-mip: Support for 2712's MIP
See: raspberrypi/linux#5866

kernel: ARM: pl011: Add rs485 to the RP1 support
See:https://forums.raspberrypi.com/viewtopic.php?p=2182093