device.h: fix unbalanced initializer: ({ .pm_base = (pm_),)}

Close parentheses and braces in the reverse order they are opened.

Fixes commit f91d4731 ("pm: use braces for .pm_base inside anonymous
union initializer")

I have no idea how no compiler caught this!?

I tested very carefully with two different gcc versions and one clang
version and generated binaries are strictly identical before and after
this commit. Fix the code anyway because C macros are painful enough to
debug already, so no need to add more confusion.

Signed-off-by: Marc Herbert <marc.herbert@intel.com>