Remove all custom patches and start fresh

CONFIG_PREBOOT might need re-work, thus let's start fresh to see
check uboot environment before changes.

Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>

fu540-boot-mmc-pxe.patch

@@ -1,13 +0,0 @@
-diff --git a/include/configs/sifive-fu540.h b/include/configs/sifive-fu540.h
-index ba4aa065..7eedc765 100644
---- a/include/configs/sifive-fu540.h
-+++ b/include/configs/sifive-fu540.h
-@@ -26,6 +26,8 @@
- #define CONFIG_ENV_SIZE			SZ_128K
- 
- #define BOOT_TARGET_DEVICES(func) \
-+	func(MMC, mmc, 0) \
-+	func(PXE, pxe, na) \
- 	func(DHCP, dhcp, na)
- 
- #include <config_distro_bootcmd.h>

sifive-fu540-remove-CONFIG_PREBOOT.patch

@@ -1,13 +0,0 @@
-diff --git a/include/configs/sifive-fu540.h b/include/configs/sifive-fu540.h
-index 676db59..7eedc76 100644
---- a/include/configs/sifive-fu540.h
-+++ b/include/configs/sifive-fu540.h
-@@ -42,8 +42,4 @@
- 	"ramdisk_addr_r=0x88300000\0" \
- 	BOOTENV
- 
--#define CONFIG_PREBOOT \
--	"setenv fdt_addr ${fdtcontroladdr};" \
--	"fdt addr ${fdtcontroladdr};"
--
- #endif /* __CONFIG_H */

uboot-tools.spec

@@ -29,10 +29,6 @@ Patch8:    ARM-tegra-Add-NVIDIA-Jetson-Nano.patch
 Patch9:    arm-tegra-defaine-fdtfile-for-all-devices.patch
 Patch10:   env-fix-build-error-for-envtools.patch
 
-Patch20:   sifive-fu540-remove-CONFIG_PREBOOT.patch
-Patch21:   env-fix-build-error-for-envtools.patch
-Patch22:   fu540-boot-mmc-pxe.patch
-
 BuildRequires:  bc
 BuildRequires:  dtc
 BuildRequires:  make