[MC/AsmParser] Fix use of Arm calling convention in target agnostic test

[luismarques]

Summary

This test originally targeted thumbv7. When it was changed to be a target-independent test the use of the ARM_AAPCS calling convention was left in. That causes failures when running the test on targets that do not support that CC, such as RISC-V. This patch removes the calling convention specifier.

llvm/test/MC/AsmParser/include.ll

 ; RUN: llc -I %p/Inputs -filetype asm -o - %s | FileCheck %s
 ; REQUIRES: default_triple
 
 module asm ".include \22module.x\22"
 
-define arm_aapcscc void @f() {
+define void @f() {
 entry:
   call void asm sideeffect ".include \22function.x\22", ""()
   ret void
 }
 
 ; CHECK: .set MODULE, 1
 ; CHECK: .set FUNCTION, 1