aarch64/testsuite: fix auto-init-padding-[24].c testcases [PR122402]

aarch64/testsuite: fix auto-init-padding-[24].c testcases [PR122402]

After r16-3956-gf613fdc6920c83, these 2 testcases start to fail as
now SRA will fully scalarize the structs and only provide with the piece
that was used. But the testcase is testing about the padding so turning
off SRA is correct in this case.

Pushed as obvious after testing the testcases now pass.

	PR target/122402
gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/auto-init-padding-2.c: Turn off SRA.
	* gcc.target/aarch64/auto-init-padding-4.c: Likewise.

Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>