[PATCH 3/6] net: stmmac: stmmac_platform: fix parsing of DT binding

From: Niklas Cassel commit 64c3b252e9fc ("net: stmmac: fixed the pbl setting with DT") changed the parsing of the DT binding. Before 64c3b252e9fc, snps,fixed-burst and snps,mixed-burst were parsed regardless if the property snps,pbl existed or not. After the commit,

[PATCH 3/6] net: stmmac: stmmac_platform: fix parsing of DT binding

From: Niklas Cassel commit 64c3b252e9fc ("net: stmmac: fixed the pbl setting with DT") changed the parsing of the DT binding. Before 64c3b252e9fc, snps,fixed-burst and snps,mixed-burst were parsed regardless if the property snps,pbl existed or not. After the commit, fixed burst and mixed burst