Fix __init section mismatch in usb gadget driver

Fix __init section mismatch in usb gadget driver

gcc complains when __init variables or __init functions
are referenced from non-init code, as by the time the
non-init code is run, the __init variables and functions
it references might no longer exist.

Fix by removing the __init from the afunc_bind defition.
This allows it to be called from anywhere, anytime without
problem.

WARNING: drivers/usb/gadget/g_audio.o(.text+0x101c): Section
mismatch in reference from the function audio_bind_config()
to the function .init.text:afunc_bind()
The function audio_bind_config() references
the function __init afunc_bind().
This is often because audio_bind_config lacks a __init
annotation or the annotation of afunc_bind is wrong.

Bug 200187768

Change-Id: I3df30f66a100273b6b1d9b1a29a2ded022027690
Signed-off-by: Joe Korty <joe.korty@ccur.com>
Signed-off-by: Gaurav Singh <gaursingh@nvidia.com>
Reviewed-on: http://git-master/r/1163919
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bibek Basu <bbasu@nvidia.com>