remoteproc/wkup_m3: Use MODULE_DEVICE_TABLE to export alias

Use MODULE_DEVICE_TABLE with wkup_m3_rproc_of_match so the module alias
is exported and the wkup_m3_rproc driver can automatically probe.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>