riscv: defconfig: enable pinctrl and dwmac support for TH1520

Enable pinctrl and ethernet dwmac driver for the TH1520 SoC boards like
the BeagleV Ahead and the Sipeed LicheePi 4A.

Signed-off-by: Drew Fustini <drew@pdp7.com>
Reviewed-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Link: https://lore.kernel.org/r/20241113184333.829716-1-drew@pdp7.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

Author: pdp7

arch/riscv/configs/defconfig

@@ -167,6 +167,7 @@ CONFIG_PINCTRL_SOPHGO_CV1800B=y
 CONFIG_PINCTRL_SOPHGO_CV1812H=y
 CONFIG_PINCTRL_SOPHGO_SG2000=y
 CONFIG_PINCTRL_SOPHGO_SG2002=y
+CONFIG_PINCTRL_TH1520=y
 CONFIG_GPIO_DWAPB=y
 CONFIG_GPIO_SIFIVE=y
 CONFIG_POWER_RESET_GPIO_RESTART=y
@@ -242,6 +243,7 @@ CONFIG_RTC_DRV_SUN6I=y
 CONFIG_DMADEVICES=y
 CONFIG_DMA_SUN6I=m
 CONFIG_DW_AXI_DMAC=y
+CONFIG_DWMAC_THEAD=m
 CONFIG_VIRTIO_PCI=y
 CONFIG_VIRTIO_BALLOON=y
 CONFIG_VIRTIO_INPUT=y