drm/amd/display: dont subst v without RISCV_ISA_V

[YukariChiba]

Prevent v in rv64 to be removed by subst.

Summary by Sourcery

Bug Fixes:

• Prevent unconditional removal of the ‘v’ extension from the march string in rv64 builds

[sourcery-ai]

Reviewer's Guide

The PR updates the Makefile for the AMD display DC DML driver to only strip the RISC-V “v” extension from the -march flag when CONFIG_RISCV_ISA_V is enabled, preserving the original ISA string otherwise.

File-Level Changes

Change	Details	Files
Conditionalize removal of the RISC-V “v” ISA extension on CONFIG_RISCV_ISA_V	Added an ifdef CONFIG_RISCV_ISA_V guard around the subst-v removal Moved dml_ccflags assignment for removing “v” inside the guarded block Added an else branch that assigns dml_ccflags without stripping “v” Closed the conditional with an endif	drivers/gpu/drm/amd/display/dc/dml/Makefile

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[Copilot]

Pull Request Overview

This PR fixes a bug in the AMD display driver's DML Makefile that was incorrectly removing the 'v' character from RISC-V architecture flags without checking if the V extension was actually configured.

• Adds conditional check for CONFIG_RISCV_ISA_V before applying the substitution that removes 'v' from the march flag
• Preserves the original riscv-march-y value when V extension is not configured

[Copilot]

The comment should be updated to clarify that V is only removed when CONFIG_RISCV_ISA_V is enabled, as the behavior has changed with the conditional logic.

Suggested change

	# Remove V from the ISA string, like in arch/riscv/Makefile, but keep F and D.
	# When CONFIG_RISCV_ISA_V is enabled, remove V from the ISA string (like in arch/riscv/Makefile), but keep F and D.

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: opsiff

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• deepin/OWNERS [opsiff]

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[sourcery-ai]

Hey @YukariChiba - I've reviewed your changes and they look great!

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