Use tcp buffer values for rat LTE_CA

- currently the tcp buffer values used are
the values for LTE, which are different
- only check new service state to decide
if carrier aggregation is used and use LTE_CA
rat if true

Bug: 77214748
Test: manual, check tcp buffer values for LTE_CA
Change-Id: If34638b9e7693873f0273e98480e1b41b9fd7a45
Merged-In: If34638b9e7693873f0273e98480e1b41b9fd7a45