[Phytium [Deepin Kernel SIG] ]net: macb: phytium-gem: donot convert the enum constant to a boolean

[Avenger-285714]

Fix follow error with clang-19:

drivers/net/ethernet/cadence/macb_main.c:724:71: error: converting the enum constant to a boolean [-Werror,-Wint-in-bool-context]
724 | if (macb_is_gem(bp) && (state->interface == PHY_INTERFACE_MODE_SGMII ||
| ^
1 error generated.

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 代码修改中，逻辑判断条件被简化，提高了代码的可读性。

是否建议立即修改:

• 否，这次提交的修改没有引入新的问题，也没有改变原有的逻辑。因此，不需要立即进行修改。但是，建议进行进一步的代码审查以确保没有其他潜在的问题。

[deepin-ci-robot]

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