Enable package install for arm64

[FabianVolkers]

I've modified the install script to allow package install for arm64.

• remove fallback to source install when architecture is arm64
• update freeswitch repository sources. The main repo contains arm64 packages these days
• fix php version mismatch. (8.2 vs 8.1). On arm64 php 8.2 is selected in php.sh, added the same logic to nginx.sh and added php8.2 option for nginx
• fix php install for arm architectures. The if statement bypassed the php install entirely when architecture was not x86
• enable sngrep package install for arm

The changes in this PR were tested on a raspberry pi 4.

Let me know if there is any changes you disagree with.