gdb: Update version specifier to use wildcard

* Match for 7.7* versions
* Apply a common set of changes for all 7.7 versions

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
shadow: Update version to match generic wildcard

* Match all versions of shadow
* Problem still exists in toolchain, the workaround still applies to
  newer versions of shadow

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>
common/linux/zynq/defconfig_3.14.cfg: Add configs for USB

* Add configs for Zynq USB OTG functionality, these config options are
  required for the OTG dual role to function correctly.

Signed-off-by: Nathan Rossi <nathan.rossi@xilinx.com>