arm: Fix mve_vmvnq_n_<supf><mode> argument mode

arm: Fix mve_vmvnq_n_<supf><mode> argument mode

The vmvnq_n* intrinsics and have [u]int[16|32]_t arguments, so use
<V_elem> iterator instead of HI in mve_vmvnq_n_<supf><mode>.

Most of the work of this patch series was carried out while I was
working at STMicroelectronics as a Linaro assignee.

2022-02-22  Christophe Lyon  <christophe.lyon@arm.com>

	gcc/
	* config/arm/mve.md (mve_vmvnq_n_<supf><mode>): Use V_elem mode
	for operand 1.