Radio and Dual SIM - RU - Decimal comma required

[Modify]
Use a decimal comma (,) instead of a decimal period(.) when
showing frequency throughout the application.

from: https://partner-android-review.googlesource.com/#/c/201685/


Bug:19206785
Change-Id: Ib98725442186dad65b0acd93ec61798024b8413a
Signed-off-by: Tony Kuo <tony.kuo@mediatek.com>