devicetree: Remove lpc interrupt properties
devicetree: Remove lpc interrupt properties

After commit 7b12d5489fcf ("hw/lpc: Configure SerIRQ interrupts on
P9P"), we abort on p9p Simics:

[ 1486.000029845,3] Duplicate property "interrupt-map" in node /lpcm-opb@6030000000000/lpc@f0000000
[ 1487.000158147,0] Aborting!
CPU 0000 Backtrace:
 S: 0000000031c13940 R: 0000000030013d18   .backtrace+0x5c
 S: 0000000031c139f0 R: 000000003001dbf8   ._abort+0x60
 S: 0000000031c13a80 R: 000000003002d448   .new_property+0x94
 S: 0000000031c13b20 R: 000000003002d5e8   .dt_add_property+0xd0
 S: 0000000031c13bc0 R: 000000003004202c   .lpc_create_int_map+0xa4
 S: 0000000031c13da0 R: 0000000030043748   .lpc_finalize_interrupts+0x94
 S: 0000000031c13e30 R: 0000000030015d18   .main_cpu_entry+0x620
 S: 0000000031c13f00 R: 0000000030002740   boot_entry+0x1b8

Since skiboot creates these interrupt properties now, and always has on
older p9 systems, remove them from the input device tree.

Signed-off-by: Reza Arbab <4c896a97e6b998365c2d50a267b0f1ca5f7995de@linux.ibm.com>
Signed-off-by: Oliver O'Halloran <3dfaff8fa6ae977f042064a112a6aac576279b9b@gmail.com>

open-power/skiboot,qemu/skiboot,shenki/skiboot,legoater/skiboot,qemu/skiboot,qemu/skiboot,shenki/skiboot,shenki/skiboot,legoater/skiboot,open-power/skiboot,qemu/skiboot,legoater/skiboot,qemu/skiboot,shenki/skiboot,open-power/skiboot,shenki/skiboot,open-power/skiboot,open-power/skiboot,legoater/skiboot,legoater/skiboot