Directory Structure Adjustment

Example: Add support directories for RISC-V in kexec-tools

Project URL: https://gitee.com/src-openeuler/kexec-tools
RISC-V Patch file URL: support_riscv.patch

Partial list of the original project directories:

/purgatory/arch/alpha
/purgatory/arch/arm
/purgatory/arch/arm64
/purgatory/arch/i386
/purgatory/arch/ia64
/purgatory/arch/mips
/purgatory/arch/ppc
/purgatory/arch/ppc64
/purgatory/arch/s390
/purgatory/arch/sh
/purgatory/arch/x86_64

Based on the highlighted architecture keywords, the following additional directories are required to support the RISC-V architecture.

/purgatory/arch/riscv
/purgatory/arch/riscv64