net: ethernet: mtk_wed: fix firmware loading for MT7986 SoC

The WED mcu firmware does not contain all the memory regions defined in
the dts reserved_memory node (e.g. MT7986 WED firmware does not contain
cpu-boot region).
Reverse the mtk_wed_mcu_run_firmware() logic to check all the fw
sections are defined in the dts reserved_memory node.

Fixes: c6d961ae

 ("net: ethernet: mtk_wed: move mem_region array out of mtk_wed_mcu_load_firmware")
Tested-by: Frank Wunderlich <frank-w@public-files.de>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/d983cbfe8ea562fef9264de8f0c501f7d5705bd5.1698098381.git.lorenzo@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>