arm: remove obsolete vcond expanders

arm: remove obsolete vcond expanders

The vcond{,u} expander paterns have been declared as obsolete.  Remove
them from the Arm backend.

gcc/ChangeLog:

	PR target/114189
	* config/arm/arm-protos.h (arm_expand_vcond): Delete prototype.
	* config/arm/arm.cc (arm_expand_vcond): Delete function.
	* config/arm/vec-common.md (vcond<mode><mode>): Delete pattern
	(vcond<V_cvtto><mode>): Likewise.
	(vcond<VH_cvtto><mode>): Likewise.
	(vcondu<mode><v_cmp_result>): Likewise.