riscv: dts: starfive: remove "snps,en-tx-lpi-clockgating" property

Whether the MII transmit clock can be stopped is primarily a property
of the PHY (there is a capability bit that should be checked first.)
Whether the MAC is capable of stopping the transmit clock is a separate
issue, but this is already handled by the core DesignWare MAC code.

As commit "net: stmmac: starfive: use PHY capability for TX clock stop"
adds the flag to use the PHY capability, remove the DT property that is
now unecessary.

Cc: Samin Guo <samin.guo@starfivetech.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://patch.msgid.link/E1tsIU5-005vGR-4c@rmk-PC.armlinux.org.uk
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

arch/riscv/boot/dts/starfive/jh7110.dtsi

@@ -1022,7 +1022,6 @@
 			snps,force_thresh_dma_mode;
 			snps,axi-config = <&stmmac_axi_setup>;
 			snps,tso;
-			snps,en-tx-lpi-clockgating;
 			snps,txpbl = <16>;
 			snps,rxpbl = <16>;
 			starfive,syscon = <&aon_syscon 0xc 0x12>;
@@ -1053,7 +1052,6 @@
 			snps,force_thresh_dma_mode;
 			snps,axi-config = <&stmmac_axi_setup>;
 			snps,tso;
-			snps,en-tx-lpi-clockgating;
 			snps,txpbl = <16>;
 			snps,rxpbl = <16>;
 			starfive,syscon = <&sys_syscon 0x90 0x2>;