Document Gigabyte GA-G41M-ES2L

To replace wiki page https://www.coreboot.org/Board:gigabyte/ga-g41m-es2l

+ configs/config.gigabyte_ga-g41m-es2l
+ lshw output examples
+ memory modules compatibility

Tested in Devuan 4 Chimaera.
Tested from exact steps from this documentation.

Change-Id: Ib45cfea15b43d7399e9d209f7ba7c6b24fe860dd
Signed-off-by: Alexey Vazhnov <vazhnov@boot-keys.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50368
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Evgeny Zinoviev <me@ch1p.io>

configs/config.gigabyte_ga-g41m-es2l

@@ -0,0 +1,13 @@
+CONFIG_VENDOR_GIGABYTE=y
+CONFIG_BOARD_GIGABYTE_GA_G41M_ES2L=y
+CONFIG_MAINBOARD_VERSION="1.1"
+CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT=y
+CONFIG_ONBOARD_VGA_IS_PRIMARY=y
+CONFIG_PAYLOAD_CONFIGFILE=".config_seabios"
+CONFIG_USE_OPTION_TABLE=y
+CONFIG_USE_BLOBS=y
+CONFIG_CPU_MICROCODE_CBFS_GENERATE=y
+
+# It is better to take this unique value from old CMOS.
+# Default MAC-address is 00:e0:4c:00:c0:b0
+# CONFIG_REALTEK_8168_MACADDRESS="6c:f0:49:xx:xx:xx"