[POWERPC] Cleanup pegasos i8259 not in device tree workaround.

[Grant Likely <grant.likely@gmail.com>]

From: Grant Likely <grant.likely@secretlab.ca>

Only make assumptions about i8259 presence if ppc_md.get_irq is not set.
Previous workaround only checked chrp_mpic value.

Nicolas, please verify that this patch fixes your mpc52xx pic problems.
Ben, I got tired of how often this question was being raised, so I just
wrote this patch; I've compiled, but cannot test it.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
---
 arch/powerpc/platforms/chrp/setup.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/platforms/chrp/setup.c b/arch/powerpc/platforms/chrp/setup.c
index 49b8dab..a5466ed 100644
--- a/arch/powerpc/platforms/chrp/setup.c
+++ b/arch/powerpc/platforms/chrp/setup.c
@@ -451,7 +451,7 @@ static void __init chrp_find_8259(void)
 	 * we have a pegasos that claims to be chrp but doesn't have
 	 * a proper interrupt tree
 	 */
-	if (pic == NULL && chrp_mpic != NULL) {
+	if (pic == NULL && ppc_md.get_irq != NULL) {
 		printk(KERN_ERR "i8259: Not found in device-tree"
 		       " assuming no legacy interrupts\n");
 		return;
-- 
1.4.3.rc2.g0503