This simple follow-on patch adds a feature bit (FP16) that was missing
from the initial Neoverse V1 support.

Testing:
 * Regression tested on arm-none-eabi.

OK for master?

Thanks,
Alex

---

gas/ChangeLog:

2020-09-25  Alex Coplan  <alex.coplan@arm.com>

	* config/tc-arm.c (arm_cpus): Add FP16 to Neoverse V1.