mb/lenovo/thinkcentre_a58: Extend mb name

While branded as thinkcentre a58 this board can also be found as
"L-IG41M".

Change-Id: I06ed424138c46c6b2f29f15c7ea5c3648b26a8d3
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/31109
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/lenovo/thinkcentre_a58/Kconfig.name

@@ -1,2 +1,2 @@
 config BOARD_LENOVO_THINKCENTRE_A58
-	bool "ThinkCentre A58"
+	bool "ThinkCentre A58 (L-IG41M)"