config: rockchip64: build Motorcomm YT6801 drivers built-in for OOB Ethernet (#9625)

* config: rockchip64: build Motorcomm Ethernet driver into kernel
* config: rockchip64: drop redundant STMMAC_PCI dependency

After testing, STMMAC_PCI proved to be unnecessary for the YT6801
PCIe controller as it relies on its own glue driver.

DWMAC_MOTORCOMM is kept as built-in (=y) to ensure OOB networking,
as module auto-loading fails during early boot.

* config: rockchip64: remove unnecessary STMMAC_PLATFORM from OPi5 Pro configs

---------
Signed-off-by: c127dev <contact@c127.dev>

Author: c127dev

config/kernel/linux-rockchip64-current.config

@@ -906,6 +906,7 @@ CONFIG_MARVELL_88X2222_PHY=m
 CONFIG_MAXLINEAR_GPHY=m
 CONFIG_MICREL_PHY=y
 CONFIG_MICROCHIP_T1_PHY=m
+CONFIG_DWMAC_MOTORCOMM=y
 CONFIG_MOTORCOMM_PHY=y
 CONFIG_NATIONAL_PHY=m
 CONFIG_NXP_C45_TJA11XX_PHY=m

config/kernel/linux-rockchip64-edge.config

@@ -880,7 +880,7 @@ CONFIG_ROCKER=m
 CONFIG_SFC_SIENA=m
 CONFIG_SMC91X=y
 CONFIG_SMSC911X=y
-CONFIG_STMMAC_ETH=m
+CONFIG_STMMAC_ETH=y
 CONFIG_MSE102X=m
 CONFIG_XILINX_EMACLITE=m
 CONFIG_XILINX_LL_TEMAC=m
@@ -904,7 +904,8 @@ CONFIG_MARVELL_88X2222_PHY=m
 CONFIG_MAXLINEAR_GPHY=m
 CONFIG_MICREL_PHY=y
 CONFIG_MICROCHIP_T1_PHY=m
-CONFIG_MOTORCOMM_PHY=m
+CONFIG_DWMAC_MOTORCOMM=y
+CONFIG_MOTORCOMM_PHY=y
 CONFIG_NATIONAL_PHY=m
 CONFIG_NXP_C45_TJA11XX_PHY=m
 CONFIG_AT803X_PHY=m