alpha: fix two section mismatch warnings

Fix the following section mismatch warnings:

WARNING: o-alpha/vmlinux.o(.text+0x1a4d4): Section mismatch: reference to .init.text:free_area_init (between 'paging_init' and 'srm_paging_stop')
WARNING: o-alpha/vmlinux.o(.text+0x1a4dc): Section mismatch: reference to .init.text:free_area_init (between 'paging_init' and 'srm_paging_stop')

One instance of paging_init() was declared __init but not the other one -
used by defconfig. Fixed by declaring the second instance ___init too.

Signed-off-by: Sam Ravnborg <[e-mail]>
Cc: Ivan Kokshaysky <[e-mail]>
Cc: Richard Henderson <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/alpha/mm/init.c

···
 /*
  * paging_init() sets up the memory map.
  */
-void
-paging_init(void)
+void __init paging_init(void)
 {
 	unsigned long zones_size[MAX_NR_ZONES] = {0, };
 	unsigned long dma_pfn, high_pfn;