remoteproc: stm32: fix incorrect optional pointers

remoteproc: stm32: fix incorrect optional pointers

Compile-testing without CONFIG_OF shows that the of_match_ptr() macro
was used incorrectly here:

drivers/remoteproc/stm32_rproc.c:662:34: warning: unused variable 'stm32_rproc_match' [-Wunused-const-variable]

As in almost every driver, the solution is simply to remove the
use of this macro. The same thing happened with the deprecated
SIMPLE_DEV_PM_OPS(), but the corresponding warning was already shut
up with __maybe_unused annotations, so fix those as well by using the
correct DEFINE_SIMPLE_DEV_PM_OPS() macros and removing the extraneous
__maybe_unused modifiers. For completeness, also add a pm_ptr() to let
the PM ops be eliminated completely when CONFIG_PM is turned off.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202307242300.ia82qBTp-lkp@intel.com
Fixes: 03bd158e1535 ("remoteproc: stm32: use correct format strings on 64-bit")
Fixes: 410119ee29b6 ("remoteproc: stm32: wakeup the system by wdg irq")
Fixes: 13140de09cc2 ("remoteproc: stm32: add an ST stm32_rproc driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Link: https://lore.kernel.org/r/20230724195704.2432382-1-arnd@kernel.org
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>