dts: Add new channelIds for Demo Mode

The following new channelIds are necessary for Demo mode:
- ro.carrier=demogb / channelId=109 (decimal): for UK;
- ro.carrier=retdemo / channelid=110 (decimal): general demo mode for
Europe

Change-Id: Ia77fa983324a944efbe024ba768b8b78bce32f2f
Signed-off-by: Tarciano Facco Pegoraro <tarciano@motorola.com>
Reviewed-on: https://gerrit.mot.com/2524122
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Alessandro Ramos Bernardes Dias <aledias@motorola.com>
Reviewed-by: Zhenxin Xi <xizx@motorola.com>
Submit-Approved: Jira Key

qcom/carrier-channel-ids.dtsi

@@ -123,8 +123,8 @@
 		"veoneu",	/* 106 */
 		"openeu",	/* 107 */
 		"reteu2",	/* 108 */
-		"undefined",	/* 109 */
-		"undefined",	/* 110 */
+		"demogb",	/* 109 */
+		"retdemo",	/* 110 */
 		"undefined",	/* 111 */
 		"undefined",	/* 112 */
 		"undefined",	/* 113 */