resource: add resource_type() and IORESOURCE_TYPE_BITS
Add resource_type() and IORESOURCE_TYPE_BITS. They make it easier to add
more resource types without having to rewrite tons of code.
Signed-off-by: Magnus Damm <damm@igel.co.jp> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Jean Delvare <khali@linux-fr.org> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>