usb: host: ehci-xilinx: Fix quoted string split across lines

usb: host: ehci-xilinx: Fix quoted string split across lines

This patch resolves checkpatch warnings for xilinx EHCI driver.

Addressed warnings:

WARNING: quoted string split across lines
50: FILE: drivers/usb/host/ehci-xilinx-of.c:50:
+			"The USB host controller does not support full speed "
+			"nor low speed devices\n");

WARNING: quoted string split across lines
53: FILE: drivers/usb/host/ehci-xilinx-of.c:53:
+			"You can reconfigure the host controller to have "
+			"full speed support\n");

Signed-off-by: Piyush Mehta <piyush.mehta@xilinx.com>
Link: https://lore.kernel.org/r/20220510132252.26001-1-piyush.mehta@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>