include: linux: Update Linux headers to v5.12-rc1

Update Linux headers to v5.12-rc1, to provide the
MEDIA_ENT_F_PROC_VIDEO_ISP entity function.

The DRM FourCC and modifiers that were manually added in commits
9db0ed5e2065, 38f2efb05cef and 90c793c6989f are kept. New Intel DRM
format modifiers are conflicting with IPU3_FORMAT_MOD_PACKED, which is
updated as a result.

The V4L2 controls and formats that were manually added in commit
43d81d43fe91 are kept. This causes a c
	void prepare(IPAContext &context, const uint32_t frame,
		     IPAFrameContext &frameContext,
		     rkisp1_params_cfg *params) override;
};

} /* namespace ipa::rkisp1::algorithms */
} /* namespace libcamera */