hw/misc/Kconfig: Replace bus selects with depends on

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>
hw/intc/Kconfig: Fix OPENPIC typo

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>
hw/ppc/Makefile.objs: Create PPC405_UC for ppc405_uc.c

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>
hw/ppc/Kconfig: Add Kconfig for PPC

Signed-off-by: Ákos Kovács <akoskovacs@gmx.com>