[a23.2] riscv版本虚拟机启动失败

【故障现象】
riscv虚拟机启动时，串口日志：
loader/efi/linux.c:283:linux: Installed/updated FDT configuration table @ 0x83fff760
loader/efi/linux.c:342:linux: linux command line: 'BOOT_IMAGE=/images/pxeboot/vmlinuz inst.stage2=hd:LABEL=Anolis-23-riscv64 ro'
loader/efi/linux.c:116:linux: kernel_addr: 0xf9a0f000 handover_offset: 0xf5523c params: 0xf9a0f000
!!!! RISCV64 Exception Type - 000000000000000C(EXCEPT_RISCV_INST_ACCESS_PAGE_FAULT) !!!!
     t0 = 0x00000000000001000        t1 = 0x000000000FF240B6E
	 t2 = 0x00000000000001000        t3 = 0x00000000009576E91
	 t4 = 0x00000000000006D3F        t5 = 0x000000000000011D2
	 t6 = 0x00000000000000004        s0 = 0x00000000083FFF730
	 s1 = 0x00000000000000013        s2 = 0x00000000020000000
	 s3 = 0x00000000000000000        s4 = 0x000000000BFE00000
	 s5 = 0x0000000000000000C        s6 = 0x08000000A00006800
	 s7 = 0x00000000000000010        s8 = 0x00000000000002000
	 s9 = 0x00000000080043740        s10 = 0x00000000000000000
	 s11 = 0x00000000000000000       a0 = 0x000000000FF146718
	 a1 = 0x000000000FFFFE018        a2 = 0x000000000F9A0F000
     a3 = 0x000000000FFFFE018        a4 = 0x000000000FF146718
	 a5 = 0x000000000FA96423C        a6 = 0x000000000FF25A498
	 a7 = 0x00000000000000018        zero = 0x00000000000000000
	 ra = 0x000000000FDB06AE2        sp = 0x00000000000000003
	 gp = 0x00000000000000000        tp = 0x0000000008004E000
	 sepc = 0x000000000FA96423C      sstatus = 0x08000000200006120

错误码：EXCEPT_RISCV_INST_ACCESS_PAGE_FAULT
异常PC: 0x000000000FA96423C

此地址: kernel_addr: 0xf9a0f000  + handover_offset: 0xf5523c = 0xfa96423c,为__efistub_efi_pe_entry入口地址。
在riscv场景下，当前没有可执行权限导致异常。需同步如下补丁修复：
https://github.com/rhboot/grub2/commit/ba84a3e50533138afe65c5b87b13cf8a0df90393

src-anolis-os/grub2

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