mvebu: Remove patch only needed for kernel 5.10

Kernel 5.10 is not supported by OpenWrt 21.02, remove this patch.

Fixes: d530ff37bf ("mvebu: armada 370: dts: fix the crypto engine")
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/mvebu/patches-5.10/317-armada-370-dts-fix-crypto-engine.patch

@@ -1,29 +0,0 @@
---- a/arch/arm/boot/dts/armada-370.dtsi
-+++ b/arch/arm/boot/dts/armada-370.dtsi
-@@ -234,7 +234,7 @@
- 				clocks = <&gateclk 23>;
- 				clock-names = "cesa0";
- 				marvell,crypto-srams = <&crypto_sram>;
--				marvell,crypto-sram-size = <0x7e0>;
-+				marvell,crypto-sram-size = <0x800>;
- 			};
- 		};
- 
-@@ -255,12 +255,17 @@
- 			 * cpuidle workaround.
- 			 */
- 			idle-sram@0 {
-+				status = "disabled";
- 				reg = <0x0 0x20>;
- 			};
- 		};
- 	};
- };
- 
-+&coherencyfab {
-+	broken-idle;
-+};
-+
- /*
-  * Default UART pinctrl setting without RTS/CTS, can be overwritten on
-  * board level if a different configuration is used.