i8259: Move to hw library

No target-specific bits remaining, let's move it over.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/default-configs/ppc64-softmmu.mak b/default-configs/ppc64-softmmu.mak
index d5073b3..8874115 100644
--- a/default-configs/ppc64-softmmu.mak
+++ b/default-configs/ppc64-softmmu.mak
@@ -31,3 +31,4 @@
 CONFIG_PFLASH_CFI01=y
 CONFIG_PFLASH_CFI02=y
 CONFIG_PTIMER=y
+CONFIG_I8259=y