usb: phy: add missing MODULE_DESCRIPTION() macros

With ARCH=x86, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/usb/phy/phy-am335x-control.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/usb/phy/phy-am335x.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://lore.kernel.org/r/20240611-md-drivers-usb-phy-v1-1-1cacb41280c3@quicinc.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/phy/phy-am335x-control.c

@@ -189,4 +189,5 @@ static struct platform_driver am335x_control_driver = {
 };
 
 module_platform_driver(am335x_control_driver);
+MODULE_DESCRIPTION("AM335x USB PHY Control Driver");
 MODULE_LICENSE("GPL v2");

drivers/usb/phy/phy-am335x.c

@@ -142,4 +142,5 @@ static struct platform_driver am335x_phy_driver = {
 };
 
 module_platform_driver(am335x_phy_driver);
+MODULE_DESCRIPTION("AM335x USB PHY Driver");
 MODULE_LICENSE("GPL v2");