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[amd64] enable CONFIG_DRM_SIMPLEDRM and CONFIG_DRM as built-in, re-enable CONFIG_SYSFB_SIMPLEFB for Plymouth support without drivers/firmwares

Luca Boccassi requested to merge bluca/linux:simpledrm into debian/latest

This enables UEFI systems to use the EFI framebuffer, so that a graphical Plymouth output can be displayed immediately, without requiring hardware specific kernel drivers and firmware.

This is especially useful to build generic UKIs that still support Plymouth in the initrd by adding 'plymouth.use-simpledrm' to the kernel command line.

Fedora 42 switched to this for their builds too.

https://fedoraproject.org/wiki/Changes/PlymouthUseSimpledrm https://gitlab.freedesktop.org/plymouth/plymouth/-/issues/264

CONFIG_SYSFB_SIMPLEFB was disabled for #822575 as the simpledrm driver didn't exist at the time. The kernel maintainer specifically said to disable it until simpledrm was available.

It is now available and enabled, so turn this option back on so that it can be used with the EFI framebuffer.

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