Update from unstable

v.2020.04 from upstream.

• ported patches from Apertis
• supported boot on Sabrelite only

This is the first MR from series.

debian/patches/apertis/rockchip/0001-rockchip-rockpro64-limit-the-max-frequency-of-MMC.patch

+From: Denis Pynkin <denis.pynkin@collabora.com>
+Date: Mon, 15 Jun 2020 19:18:00 +0300
+Subject: rockchip: rockpro64: limit the max frequency of MMC
+
+With the default frequency a lot of SD-cards works incorrectly:
+problems with MMC detection and incorrect read of large files (like
+kernel/initramfs). Hence limit the maximal frequency by 25MHz to avoid
+read problems on slow cards.
+
+Kudos to Vasily Khoruzhick for advice.
+
+Signed-off-by: Denis Pynkin <denis.pynkin@collabora.com>
+---
+ arch/arm/dts/rk3399-rockpro64.dts | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/arch/arm/dts/rk3399-rockpro64.dts b/arch/arm/dts/rk3399-rockpro64.dts
+index e544deb..60eae20 100644
+--- a/arch/arm/dts/rk3399-rockpro64.dts
++++ b/arch/arm/dts/rk3399-rockpro64.dts
+@@ -627,7 +627,7 @@
+ 	cap-sd-highspeed;
+ 	cd-gpios = <&gpio0 7 GPIO_ACTIVE_LOW>;
+ 	disable-wp;
+-	max-frequency = <150000000>;
++	max-frequency = <25000000>;
+ 	pinctrl-names = "default";
+ 	pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_bus4>;
+ 	status = "okay";