change EXTRA_CFLAGS to Kbuild ccflags-y

[liulog]

Ralated to #66 .

[Copilot]

Pull request overview

This PR modernizes the Makefile to use the Kbuild-standard ccflags-y syntax instead of the deprecated EXTRA_CFLAGS variable. It also includes a minor code refactoring in the driver initialization function and updates the RISC-V toolchain prefix.

Changes:

• Converted EXTRA_CFLAGS to ccflags-y in the Makefile for compiler flags
• Updated RISC-V cross-compiler prefix from riscv64-unknown-linux-gnu- to riscv64-linux-gnu-
• Changed irq variable scope from function-level to block-level in hvisor_init()

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
driver/Makefile	Migrated compiler flags from EXTRA_CFLAGS to ccflags-y and updated RISC-V toolchain prefix
driver/hvisor.c	Narrowed scope of irq pointer variable to X86_64-specific block

Comments suppressed due to low confidence (1)

driver/Makefile:17

• This line still uses the deprecated EXTRA_CFLAGS variable. For consistency with the PR's goal of migrating to Kbuild syntax, this should be changed to ccflags-y += -DLOONGARCH64.

	EXTRA_CFLAGS += -DLOONGARCH64

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