usb: dwc3: Move CONFIG_USB_DWC3_OMAP to Kconfig

configs/am437x_gp_evm_defconfig

configs/am437x_sk_evm_defconfig

configs/am43xx_evm_defconfig

configs/am43xx_evm_ethboot_defconfig

configs/am43xx_evm_qspiboot_defconfig

configs/am43xx_evm_usbhost_boot_defconfig

configs/dra72_evm_defconfig

configs/dra74_evm_defconfig

configs/dra7xx_evm_defconfig

configs/dra7xx_evm_qspiboot_defconfig

configs/dra7xx_evm_uart3_defconfig

configs/omap5_uevm_defconfig

drivers/usb/dwc3/Kconfig

include/configs/am43xx_evm.h

include/configs/dra7xx_evm.h

include/configs/omap5_uevm.h