usb: Kconfig: migrate USB_DWC2 to Kconfig

This change migrates the USB_DWC2 configuration item to Kconfig
and runs moveconfig to adjust header files and defconfig.

Signed-off-by: Meng Dongyang <daniel.meng@rock-chips.com>
Split off into a separate patch:
Ran moveconfig to migrate other boards:
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/configs/popmetal-rk3288_defconfig b/configs/popmetal-rk3288_defconfig
index 64d38b0..6d02675 100644
--- a/configs/popmetal-rk3288_defconfig
+++ b/configs/popmetal-rk3288_defconfig
@@ -62,6 +62,7 @@
 CONFIG_SYS_NS16550=y
 CONFIG_SYSRESET=y
 CONFIG_USB=y
+CONFIG_USB_DWC2=y
 CONFIG_USB_STORAGE=y
 CONFIG_USE_TINY_PRINTF=y
 CONFIG_CMD_DHRYSTONE=y