staging: rtl8712: hal_init.c: fix comment block code style

This patch fixes several warnings caused by
malformed comments on hal_init.c and found by
checkpatch.pl.

Signed-off-by: Juliana Rodrigues <juliana.orod@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>