[ARM] Enable virtual input emulators in defconfigs of ARM hosts

The PL050 (AMBA KMI) keyboard/mouse interface device is available
for almost all ARM32 guest types hence this patch enables vmm_vinput,
ps/2 emulation, and pl050 emulator in defconfigs of various ARM hosts.

Signed-off-by: Anup Patel <anup@brainfault.org>