[ros-svn] [hpoussin] 16631: Implement SetupDiGetDeviceRegistryPropertyA/W

[hpoussin at svn.reactos.com]

Implement SetupDiGetDeviceRegistryPropertyA/W
Change the way devices are enumerated in SetupDiGetClassDevsExW. Now, it enumerates subkeys of HKLM\SYSTEM\CurrentControlSet\Enum instead of HLKM\SYSTEM\CurrentControlSet\Control\Class ones.
Free the temp buffer in SetupDiGetDeviceRegistryPropertyA only when it is no more usefull
Replace RegOpenKeyEx by RegOpenKeyExW


Updated files:
trunk/reactos/lib/setupapi/devinst.c