aarch64: Fix float <-> int errors in vld4[q]_lane intrinsics

aarch64: Fix float <-> int errors in vld4[q]_lane intrinsics

A previous commit "aarch64: Remove macros for vld4[q]_lane Neon
intrinsics" introduced some float <-> int type conversion errors.
This patch fixes those errors.

gcc/ChangeLog:

2021-08-18  Jonathan Wright  <jonathan.wright@arm.com>

	* config/aarch64/arm_neon.h (vld3_lane_f64): Use float RTL
	pattern and type cast.
	(vld4_lane_f32): Use float RTL pattern.
	(vld4q_lane_f64): Use float type cast.