rockchip-rk3588/6.11: backport Marcin Juszkiewicz's "FriendlyELEC NanoPC-T6 improvements" v6 series to fix non-LTS and split LTS version of NanoPC T6

- Marcin Juszkiewicz's series https://lore.kernel.org/all/20240829-friendlyelec-nanopc-t6-lts-v6-0-edff247e8c02@linaro.org/ has landed upstream
  - see db1dcbe5f7
  - thus we have 2 separate DTs, one for non-LTS, one for LTS; thus also 2 different Armbian boards (see separate commit)
- drop my own patch that added SPI NOR to the T6, as that is now included in the base DT
- this patch shall be dropped when `6.12-rc1` is released

patch/kernel/archive/rockchip-rk3588-6.11/1051-arm64-dts-rockchip-Add-NanoPC-T6-SPI-Flash.patch

@@ -1,38 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Ricardo Pardini <ricardo@pardini.net>
-Date: Thu, 6 Jun 2024 23:00:05 +0200
-Subject: arm64: dts: rockchip: Add NanoPC T6 SPI Flash
-
-Signed-off-by: Ricardo Pardini <ricardo@pardini.net>
----
- arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dts | 14 ++++++++++
- 1 file changed, 14 insertions(+)
-
-diff --git a/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dts b/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dts
-index 111111111111..222222222222 100644
---- a/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dts
-+++ b/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dts
-@@ -576,6 +576,20 @@ &sdmmc {
- 	status = "okay";
- };
- 
-+&sfc {
-+	pinctrl-names = "default";
-+	pinctrl-0 = <&fspim1_pins>;
-+	status = "okay";
-+
-+	flash@0 {
-+		compatible = "jedec,spi-nor";
-+		reg = <0x0>;
-+		spi-max-frequency = <50000000>;
-+		spi-rx-bus-width = <4>;
-+		spi-tx-bus-width = <1>;
-+	};
-+};
-+
- &spi2 {
- 	status = "okay";
- 	assigned-clocks = <&cru CLK_SPI2>;
--- 
-Armbian
-