[PATCH] ppc64: fix XICS startup function to enable as well

[PATCH] ppc64: fix XICS startup function to enable as well

When the generic IRQ patch went in, it changed the behaviour of setup_irq
(compared to the previous ppc64 version) in that we now don't call the
handler's enable function if it has a startup function.  The XICS interrupt
controller has a startup function, and so we weren't getting any interrupts
through the XICS because they never got enabled.  This patch adds a call to
xics_enable_irq to xics_startup and fixes the problem.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>