Fix another test that was trying to set the architecture directly
rather than using the infrastructure as intended.

gcc/testsuite:

	* gcc.target/arm/pr88648-asm-syntax-unified.c: It isn't necessary
	to try to override the architecture flags specified by arm_arch_v7a.
---
 gcc/testsuite/gcc.target/arm/pr88648-asm-syntax-unified.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)