cc3200: Remove CPU_HAS_FPU from cc3200 Kconfig.soc

Though Cortex-M4 could optionally have a floating point unit,
the MCU in the cc3200 in fact does not have an FPU.

Enabling CPU_HAS_FPU caused applications built with CONFIG_FLOAT=y
to crash during an early call to enable_floating_point().

This patch was validated by running microPython, which is one
such application.

Change-Id: I8bfd42c456524e152cbbb983001d9540d93fbe98
Signed-off-by: Gil Pitney <gil.pitney@linaro.org>