comgt-ncm: fix modem manufacturer detection

comgt-ncm: fix modem manufacturer detection

Fix an issue where NCM interface initialization fails because of wrong
modem manufacturer detection.

gcom call returns an output with Windows-style line breaks (containing \r)
what makes awk call return empty or malformed manufacturer name. Changing
awk RS variable to handle both \n and \r\n as line break fixes this issue.

Fixes #17448 and #17998 GitHub issues.

Signed-off-by: Jakub Łabuz <jakub@labuz.dev>
Link: https://github.com/openwrt/openwrt/pull/18460
Signed-off-by: Robert Marko <robimarko@gmail.com>