Remove unnecessary u-boot patch (fixes #12)

I don't know why we even needed this but apparently now we don't.

Makefile

@@ -12,12 +12,8 @@ run: $(IMAGE_NAME).img
 
 uboot:
 	git clone https://github.com/u-boot/u-boot.git --branch=v2023.10 --depth=1 2>/dev/null | true
-	cp u-boot/arch/arm/lib/bootm.c u-boot/arch/arm/lib/bootm.c.bak
-	patch u-boot/arch/arm/lib/bootm.c < arch/aarch64/res/bootm.patch
 	$(MAKE) -C u-boot rpi_3_defconfig ARCH=arm CROSS_COMPILE=aarch64-none-elf-
 	$(MAKE) -C u-boot all ARCH=arm CROSS_COMPILE=aarch64-none-elf-
-	rm u-boot/arch/arm/lib/bootm.c
-	mv u-boot/arch/arm/lib/bootm.c.bak u-boot/arch/arm/lib/bootm.c
 
 override CFLAGS += \
 	-Iarch/$(ARCH) \

arch/aarch64/res/bootm.patch

@@ -1,4 +0,0 @@
-237c237
-< 		panic("FDT and ATAGS support not compiled in\n");
----
-> 		debug("FDT and ATAGS support not compiled in but continuing anyway\n");