- Create channel ID for Softbank Japan

Creating a new channel ID (ro.carrier) for Softbank Japan.
New channel id name is 'softbank' and is been applied to all
QC active Kernels. This change is to apply to 4.19

Change-Id: I719c61694d5c05ddbbb734347a51f39370b13b71
Reviewed-on: https://gerrit.mot.com/1766200
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Tarciano Facco Pegoraro <tarciano@motorola.com>
Reviewed-by: Konstantin Makariev <kmakariev@motorola.com>
Submit-Approved: Jira Key
(cherry picked from commit e49c323af6ba61e69e6b7df36b99d6a760040d58)
Reviewed-on: https://gerrit.mot.com/1789063
Reviewed-by: Rav(CR) Vembu <raviv@motorola.com>

qcom/carrier-channel-ids.dtsi

@@ -226,7 +226,7 @@
 		"mobilpk",	/* 209 */
 		"retsea",	/* 210 */
 		"retjp",	/* 211 */
-		"undefined",	/* 212 */
+		"softbank",	/* 212 */
 		"undefined",	/* 213 */
 		"undefined",	/* 214 */
 		"undefined",	/* 215 */