usb: musb: allow musb and glue layers to be modules
This in part reverts commit 7a180e70. (usb: musb: temporarily make it bool) and while at that we also allow glue layers to be compiled as modules. There are still some other changes needed until we can have a fully functional build with this setup, but we're getting there. Signed-off-by: NFelipe Balbi <balbi@ti.com>
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