build: remove fmradio from pathmap.mk

*There is no fmradio folder in fw/base so remove this
 from being included to avoid build warnings

Partially reverts commit 9c99c1a5e177ba6233dc65155a63e85f3278afbf.

Signed-off-by: Jonathan Steadman <xxwhitehawk@gmail.com>
Change-Id: I7cbc13a5b17b19bab923b356848e0a7d3277da4e