x11-drivers/nvidia-drivers: lower KERNEL_MAX to 6.6 for 0/470

NVIDIA's support seemingly has ended, as such this will never
go up anymore (unless we patch it, which there is no plans to
support). It does not make sense to list a non-LTS branch that's
not even in the tree anymore there.

Also add a warning similar to 390.x, the date is the same given
both 6.1.x and 6.6.x kernels are going away at same time.

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

x11-drivers/nvidia-drivers/nvidia-drivers-470.256.02-r2.ebuild

@@ -7,7 +7,7 @@ MODULES_OPTIONAL_IUSE=+modules
 inherit desktop flag-o-matic linux-mod-r1 multilib readme.gentoo-r1
 inherit systemd toolchain-funcs unpacker user-info
 
-MODULES_KERNEL_MAX=6.9
+MODULES_KERNEL_MAX=6.6
 NV_URI="https://download.nvidia.com/XFree86/"
 
 DESCRIPTION="NVIDIA Accelerated Graphics Driver"
@@ -515,4 +515,14 @@ pkg_postinst() {
 		elog "Also, the systemd suspend/hibernate/resume services are now enabled by"
 		elog "default, and for openrc+elogind a similar hook has been installed."
 	fi
+
+	ewarn
+	ewarn "Be warned/reminded that the 470.xx branch reached end-of-life and"
+	ewarn "NVIDIA is no longer fixing issues (including security). Free to keep"
+	ewarn "using (for now) but it is recommended to either switch to nouveau or"
+	ewarn "replace hardware. Will be kept in-tree while possible, but expect it"
+	ewarn "to be removed likely in early 2027 or earlier if major issues arise."
+	ewarn
+	ewarn "Note that there is no plans to patch in support for kernels branches"
+	ewarn "newer than 6.6.x which will be supported upstream until December 2026."
 }