coresight-etm3x: use module_amba_driver to simplify the code

Using function "module_amba_driver()" makes the code simpler by
eliminating boilerplate code.

Wei Yongjun sent out a set of patches addressing those in all the
coresight driver but missed ETMv3.

Change-Id: I0d4abdd401443a623494c25995236bc2b556e457
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 899867ee6c1ccaa4f4580c5b14e25505e6e17b7d
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Shashank Mittal <mittals@codeaurora.org>