powerpc/vmlinux.lds: Ensure STRICT_ALIGN_SIZE is at least page aligned

powerpc/vmlinux.lds: Ensure STRICT_ALIGN_SIZE is at least page aligned

[ Upstream commit 331771e836e6a32c8632d8cf5e2cdd94471258ad ]

Add a check that STRICT_ALIGN_SIZE is aligned to at least PAGE_SIZE.

That then makes the alignment to PAGE_SIZE immediately after the
alignment to STRICT_ALIGN_SIZE redundant, so remove it.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220916131422.318752-1-mpe@ellerman.id.au
Stable-dep-of: 111bcb373853 ("powerpc/64s/radix: Fix RWX mapping with relocated kernel")
Signed-off-by: Sasha Levin <sashal@kernel.org>