arm: [MVE intrinsics] add vadc_vsbc shape

This patch adds the vadc_vsbc shape description.

2024-08-28  Christophe Lyon  <chrirstophe.lyon@linaro.org>

	gcc/
	* config/arm/arm-mve-builtins-shapes.cc (vadc_vsbc): New.
	* config/arm/arm-mve-builtins-shapes.h (vadc_vsbc): New.