Release 4.4.38-openpower1

 - Backports to fix building with modern binutils
   * powerpc: Convert cmp to cmpd in idle enter sequence
   * powerpc/boot: Request no dynamic linker for boot wrapper

 - Add fix for our xhci workarounds. This fixes a hang in Petitboot when
   shutting down with a usb device attached to an external usb hub.
    * usb/xhci: allow xhci_check_bandwith in XHCI_STATE_REMOVING

 - Move to latest upstream stable release
   * Includes fixes from 4.4.36, 4.4.37, 4.4.38

Signed-off-by: Joel Stanley <joel@jms.id.au>
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