um: Enable ARCH_HAS_GCOV_PROFILE_ALL

Enable ARCH_HAS_GCOV_PROFILE_ALL so that CONFIG_GCOV_PROFILE_ALL can be
selected on UML.  I didn't need to explicitly disable GCOV on anything
to get this to work on the configs I tested.
Signed-off-by: NVincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: NRichard Weinberger <richard@nod.at>

arch/um/Kconfig

@@ -6,6 +6,7 @@ config UML
 	bool
 	default y
 	select ARCH_EPHEMERAL_INODES
+	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_HAS_KCOV
 	select ARCH_HAS_STRNCPY_FROM_USER
 	select ARCH_HAS_STRNLEN_USER