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

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

arch/powerpc/kernel/vmlinux.lds.S

@@ -32,6 +32,10 @@
 
 #define STRICT_ALIGN_SIZE	(1 << CONFIG_DATA_SHIFT)
 
+#if STRICT_ALIGN_SIZE < PAGE_SIZE
+#error "CONFIG_DATA_SHIFT must be >= PAGE_SHIFT"
+#endif
+
 ENTRY(_stext)
 
 PHDRS {
@@ -215,7 +219,6 @@ SECTIONS
  */
 	. = ALIGN(STRICT_ALIGN_SIZE);
 	__init_begin = .;
-	. = ALIGN(PAGE_SIZE);
 	.init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {
 		_sinittext = .;
 		INIT_TEXT