[nrf toup] Disable CONFIG_FPU by default to align with OT libraries

Remove setting `CONFIG_FPU` to `y` by default as OpenThread
libraries are now build without FPU support.

Signed-off-by: Maciej Baczmanski <maciej.baczmanski@nordicsemi.no>

config/nrfconnect/chip-module/Kconfig.defaults

@@ -40,9 +40,6 @@ config ASSERT_NO_MSG_INFO
 config HW_STACK_PROTECTION
  default y
 
-config FPU
- default y
-
 config POSIX_MAX_FDS
  default 16