RISC-V: Rename the test macro for math autovec test

RISC-V: Rename the test macro for math autovec test

Rename TEST_CEIL to TEST_UNARY_CALL for the underlying function
autovec patch testing.

gcc/testsuite/ChangeLog:

	* gcc.target/riscv/rvv/autovec/test-math.h: Rename.
	* gcc.target/riscv/rvv/autovec/math-ceil-0.c: Ditto.
	* gcc.target/riscv/rvv/autovec/math-ceil-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/math-ceil-2.c: Ditto.
	* gcc.target/riscv/rvv/autovec/math-ceil-3.c: Ditto.
	* gcc.target/riscv/rvv/autovec/math-ceil-run-0.c: Ditto.
	* gcc.target/riscv/rvv/autovec/math-ceil-run-1.c: Ditto.
	* gcc.target/riscv/rvv/autovec/math-ceil-run-2.c: Ditto.

Signed-off-by: Pan Li <pan2.li@intel.com>