Saturating doubling high multiply & divide by power of two
Saturating doubling high multiply & divide by power of two

1. C equivalent for ARM NEON instruction VQRDMULH.
2. Rounding division by power of two.

Change-Id: Ia53d50661731bd16e88b71a4ba5df283f9977ce6
Signed-off-by: Felix Johnny <104ec6787d1cdaeee1fcb08a0363ff52d4299d68@arm.com>

JonatanAntoni/CMSIS_5,ARM-software/CMSIS_5,ARM-software/CMSIS_5,ARM-software/CMSIS_5,JonatanAntoni/CMSIS_5,ARM-software/CMSIS_5,JonatanAntoni/CMSIS_5,ARM-software/CMSIS_5,JonatanAntoni/CMSIS_5,JonatanAntoni/CMSIS_5,ARM-software/CMSIS_5,JonatanAntoni/CMSIS_5