arm: socfpga: socrates: Probe DWC2 UDC from OF instead of hard-coded data

This patch adds the necessary OF alias for the UDC node, which let's
the code locate the DWC2 UDC base address in OF instead of hard-coding
it into the U-Boot binary. The code is adjusted to use the address from
OF instead of the hard-coded one. Finally, the hard-coded address is
removed and USB DM support is enabled.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Lukasz Majewski <l.majewski@majess.pl>
Cc: Lukasz Majewski <l.majewski@samsung.com>
diff --git a/configs/socfpga_socrates_defconfig b/configs/socfpga_socrates_defconfig
index 932f0e8..fe940f9 100644
--- a/configs/socfpga_socrates_defconfig
+++ b/configs/socfpga_socrates_defconfig
@@ -22,3 +22,5 @@
 CONFIG_CADENCE_QSPI=y
 CONFIG_DESIGNWARE_SPI=y
 CONFIG_DM_MMC=y
+CONFIG_USB=y
+CONFIG_DM_USB=y