ArmPlatformPkg/ArmVExpressPkg: CTA9x4: Default to EDK2_ARMVE_STANDALONE=1

ArmPlatformPkg/ArmVExpressPkg: CTA9x4: Default to EDK2_ARMVE_STANDALONE=1

This patch changes the Versatile Express A9 BSP to build with
EDK2_ARMVE_STANDALONE=1 as the default option.

The user may then specify zero if they wish to build the non-standalone
version.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ryan Harkin <ryan.harkin@linaro.org>
Signed-off-by: Olivier Martin <olivier.martin@arm.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14439 6f19259b-4bc3-4df7-8a09-765794883524