[Mobile] Bugfix flag for SPN update

Bug: 350812372
Test: NONE
Flag: com.android.systemui.FLAG_STATUS_BAR_SWITCH_TO_SPN_FROM_DATA_SPN
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:96df117550d3235224e725705ae30151602416c1)
Merged-In: I48b0a6d996c99561c94295f6503482c4083d41df
Change-Id: I48b0a6d996c99561c94295f6503482c4083d41df