phy: mediatek: fix build warning of FIELD_PREP()

Change the inline function mtk_phy_update_field() into a macro to
avoid check warning of FIELD_PREP() with compiler parameter
-Wtautological-constant-out-of-range-compare

the warning is caused by mask check:
"BUILD_BUG_ON_MSG(__bf_cast_unsigned(_mask, _mask) >     \"

Fixes: 29c0747755 ("phy: mediatek: add a new helper to update bitfield")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220928070746.5393-1-chunfeng.yun@mediatek.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/mediatek/phy-mtk-io.h

@@ -36,10 +36,11 @@ static inline void mtk_phy_update_bits(void __iomem *reg, u32 mask, u32 val)
 	writel(tmp, reg);
 }
 
-/* field @mask should be constant and continuous */
-static inline void mtk_phy_update_field(void __iomem *reg, u32 mask, u32 val)
-{
-	mtk_phy_update_bits(reg, mask, FIELD_PREP(mask, val));
-}
+/* field @mask shall be constant and continuous */
+#define mtk_phy_update_field(reg, mask, val) \
+({ \
+	typeof(mask) mask_ = (mask);	\
+	mtk_phy_update_bits(reg, mask_, FIELD_PREP(mask_, val)); \
+})
 
 #endif