EDAC, mce_amd_inj: Use MCE_INJECT_GET macro for bank node too

inj_bank_get() is generic enough that we can use the MCE_INJECT_GET
macro instead.

No functionality change.

Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: mchehab@osg.samsung.com
Cc: x86-ml <x86@kernel.org>
Link: http://lkml.kernel.org/r/1433277362-10911-2-git-send-email-Aravind.Gopalakrishnan@amd.com


Signed-off-by: Borislav Petkov <bp@suse.de>