Support fn+calc on G712. Customise ROG key

reverse_eng/g712/system_info

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+artem@art-kub:~$ cat /etc/*-release
+DISTRIB_ID=Ubuntu
+DISTRIB_RELEASE=20.04
+DISTRIB_CODENAME=focal
+DISTRIB_DESCRIPTION="Ubuntu 20.04 LTS"
+NAME="Ubuntu"
+VERSION="20.04 LTS (Focal Fossa)"
+ID=ubuntu
+ID_LIKE=debian
+PRETTY_NAME="Ubuntu 20.04 LTS"
+VERSION_ID="20.04"
+HOME_URL="https://www.ubuntu.com/"
+SUPPORT_URL="https://help.ubuntu.com/"
+BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
+PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
+VERSION_CODENAME=focal
+UBUNTU_CODENAME=focal
+
+artem@art-kub:~$ hostnamectl
+   Static hostname: art-kub
+         Icon name: computer-laptop
+           Chassis: laptop
+        Machine ID: f3792a953d24486bb8881f4ab1b93e44
+           Boot ID: 5f064ae70f274461909bea1526a5b4e3
+  Operating System: Ubuntu 20.04 LTS
+            Kernel: Linux 5.4.0-39-generic
+      Architecture: x86-64
+      
+artem@art-kub:~$ cat /proc/version
+Linux version 5.4.0-39-generic (buildd@lcy01-amd64-016) (gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu2)) #43-Ubuntu SMP Fri Jun 19 10:28:31 UTC 2020
+
+artem@art-kub:~$ uname -a
+Linux art-kub 5.4.0-39-generic #43-Ubuntu SMP Fri Jun 19 10:28:31 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
+
+
+artem@art-kub:~$ cat /sys/class/dmi/id/product_name
+ROG Strix G712LV_G712LV
+
+artem@art-kub:~$ cat /sys/class/dmi/id/product_family
+ROG Strix
+
+artem@art-kub:~$ cat /sys/class/dmi/id/board_name
+G712LV
+
+artem@art-kub:~$ lsusb |grep 0b05
+Bus 001 Device 002: ID 0b05:1866 ASUSTek Computer, Inc. N-KEY Device
+
+
+
+