hw/lm32/Kconfig: Have MILKYMIST select LM32_DEVICES

hw/lm32/Kconfig: Have MILKYMIST select LM32_DEVICES

The Milkymist board requires more than the PTIMER. Directly
select the LM32_DEVICES. This fixes:

  /usr/bin/ld:
  libqemu-lm32-softmmu.fa.p/target_lm32_gdbstub.c.o: in function `lm32_cpu_gdb_read_register':
  target/lm32/gdbstub.c:46: undefined reference to `lm32_pic_get_im'
  target/lm32/gdbstub.c:48: undefined reference to `lm32_pic_get_ip'
  libqemu-lm32-softmmu.fa.p/target_lm32_op_helper.c.o: in function `helper_wcsr_im':
  target/lm32/op_helper.c:107: undefined reference to `lm32_pic_set_im'
  libqemu-lm32-softmmu.fa.p/target_lm32_op_helper.c.o: in function `helper_wcsr_ip':
  target/lm32/op_helper.c:114: undefined reference to `lm32_pic_set_ip'
  libqemu-lm32-softmmu.fa.p/target_lm32_op_helper.c.o: in function `helper_wcsr_jtx':
  target/lm32/op_helper.c:120: undefined reference to `lm32_juart_set_jtx'
  libqemu-lm32-softmmu.fa.p/target_lm32_op_helper.c.o: in function `helper_wcsr_jrx':
  target/lm32/op_helper.c:125: undefined reference to `lm32_juart_set_jrx'
  libqemu-lm32-softmmu.fa.p/target_lm32_translate.c.o: in function `lm32_cpu_dump_state':
  target/lm32/translate.c:1161: undefined reference to `lm32_pic_get_ip'
  target/lm32/translate.c:1161: undefined reference to `lm32_pic_get_im'

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20210221225626.2589247-4-f4bug@amsat.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>