am335x: enable receive interrupts on uart
am335x: enable receive interrupts on uart

agacek/libplatsupport,agacek/libplatsupport,agacek/util_libs,agacek/util_libs,seL4/libplatsupport,winksaville/libplatsupport,agacek/util_libs,agacek/util_libs,seL4/libplatsupport,winksaville/libplatsupport