create getModemEnabled function in PhoneConfigurationManager

Bug: 124402911
Test: build
Change-Id: I7b22c5b0dbe95a8e5be2e0cbf3199841d275dac7
Merged-In: I7b22c5b0dbe95a8e5be2e0cbf3199841d275dac7
(cherry picked from commit 24183ad67acd9fcf3917bd56484212740578f36c)
1 file changed